10th Class Science Light - Reflection and Refraction Question Bank

done Light - Reflection and Refraction Total Questions - 50

• question_answer1)
  Observe the given figure. What is the angle of reflection?
  A)
  \[\text{2}0{}^\circ \]                      done clear
  B)
  \[\text{4}0{}^\circ \]                      done clear
  C)
  \[\text{7}0{}^\circ \]                      done clear
  D)
  \[\text{9}0{}^\circ \] done clear
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• question_answer2)
  An object O is placed in front of a plane mirror as shown below. At which point is the image of the object 'O' formed?
  A)
  P       done clear
  B)
  Q                            done clear
  C)
  R                                            done clear
  D)
  S done clear
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• question_answer3)
  A ray of light travels from water to air as shown below. Given that the refractive index of air is 1.0 and the refractive index of water is 1.3, what is the angle of incidence?
  A)
  \[\text{22}.\text{6}{}^\circ \] done clear
  B)
  \[\text{23}.\text{1}{}^\circ \]                    done clear
  C)
  \[\text{39}.0{}^\circ \]                                  done clear
  D)
  \[\text{4}0.\text{5}{}^\circ \] done clear
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• question_answer4)
  The radius of curvature of a spherical mirror is 30 cm. What is its focal length?
  A)
  10 cm                                    done clear
  B)
  15 cm                    done clear
  C)
  20 cm                                   done clear
  D)
  25 cm done clear
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• question_answer5)
  A ray of light travels from air to glass as shown below. Given that the refractive index of air is 1.0 and the refractive index of glass is 1.5, what is the angle of refraction?
  A)
  \[\text{22}.\text{6}{}^\circ \]                    done clear
  B)
  \[\text{3}0.\text{8}{}^\circ \]                    done clear
  C)
  \[\text{35}.\text{3}{}^\circ \]                    done clear
  D)
  \[\text{4}0.0{}^\circ \] done clear
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• question_answer6)
  Which of the following correctly represents the incident ray, the refracted ray and the emergent ray in the given glass slab?                
  A)

  Incident ray	Refracted ray	Emergent ray
  PQ	QR	RS

  done clear
  B)
        

  Incident ray	Refracted ray	Emergent ray
  PQ	RS	QR

  done clear
  C)
           

  Incident ray	Refracted ray	Emergent ray
  RS	QR	PQ

                  done clear
  D)
                        

  Incident ray	Refracted ray	Emergent ray
  RS	PQ	QR

  done clear
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• question_answer7)
  A ray of light travels from water to air as shown below. Given that the refractive index of air is 1.0, what is the refractive index of glass?
  A)
  1.2                                         done clear
  B)
  1.3                         done clear
  C)
  1.4                                         done clear
  D)
  1.5 done clear
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• question_answer8)
  A light ray travels through three media as shown below. Which of the following shows the ascending order of their refractive indices?
  A)
  Medium 1, medium 2, medium 3 done clear
  B)
  Medium 2, medium 3, medium 1 done clear
  C)
  Medium 3, medium 1, medium 2 done clear
  D)
  Medium 1, medium 3, medium 2 done clear
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• question_answer9)
  Which of the following correctly shows how a light ray travels through a thick converging lens?
  A)
  P   done clear
  B)
  S                             done clear
  C)
  Q                                            done clear
  D)
  R done clear
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• question_answer10)
  Which of the emergent rays shown in the figure is the correct-one, when an incident ray strikes a diverging lens?
  A)
  P                                            done clear
  B)
  S                                                             done clear
  C)
  R                                            done clear
  D)
  Q done clear
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• question_answer11)
  What is focal length?
  A)
  The distance from the light source to the image done clear
  B)
  The distance from the object to the centre of the lens done clear
  C)
  The distance from the image to the centre of the lens done clear
  D)
  The distance from the focal point to the centre of the lens done clear
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• question_answer12)
  Which of the following statements are

  (i) The principal focus of a converging lens is real.

  (ii) The principal focus of a diverging lens is virtual.

  (iii) The principal focus of a lens always lies on the principal axis.

  A)
  Only (i) and (ii) done clear
  B)
  Only (ii) and (iii)               done clear
  C)
  Only (i) and (iii)                done clear
  D)
  (i), (ii) and (iii) done clear
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• question_answer13)
  Which of the following statements are correct?
  A)
  The image distance obtained from a far away object is the focal length of the convex lens. done clear
  B)
  The images obtained from a convex lens always lie on the focal point. done clear
  C)
  The images obtained by a convex lens are always real. done clear
  D)
  The images obtained by a convex lens are always inverted. done clear
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• question_answer14)
  An object O is placed at the position shown in the given figure. What are the characteristics of the image formed?
  A)
  Real, inverted and diminished done clear
  B)
  Real, inverted and enlarged done clear
  C)
  Virtual, inverted and diminished done clear
  D)
  Virtual, upright and enlarged done clear
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• question_answer15)
  An object O is placed at the position shown in the given figure. What are the characteristics of the image formed?
  A)
  Real, inverted and diminished done clear
  B)
  Real, inverted and enlarged done clear
  C)
  Virtual, upright and enlarged done clear
  D)
  No image is formed done clear
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• question_answer16)
  A converging lens has a focal length of 15 cm. Given that an object is placed 10 cm from the optical centre of the lens, what are the characteristics of the image formed?
  A)
  Real, inverted and diminished done clear
  B)
  Real, inverted and of the same size as the object done clear
  C)
  Real, inverted and enlarged done clear
  D)
  Virtual, upright and enlarged done clear
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• question_answer17)
  An object O and its image I drawn to scale are shown below. Identify the correct position of the converging lens.
  A)
  P                                            done clear
  B)
  Q                            done clear
  C)
  R                                            done clear
  D)
  S done clear
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• question_answer18)
  A light ray is parallel to the principal axis of a converging lens as shown below. Identify the correct position of the emergent ray.
  A)
  Q                                            done clear
  B)
  R                            done clear
  C)
  P                                            done clear
  D)
  S done clear
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• question_answer19)
  An object O is placed at the position shown in the given figure. What are the characteristics of the image formed?
  A)
  Real, inverted and diminished done clear
  B)
  Real, inverted and of the same size as the object done clear
  C)
  Real, inverted and enlarged done clear
  D)
  Virtual, upright and enlarged done clear
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• question_answer20)
  Find the position, nature and size of the image formed when an object of size 1 cm is placed at a distance of 15 cm from a concave mirror of focal length 10 cm.
  A)
  On the left side, 30 cm, real, inverted and magnified done clear
  B)
  On the left side, 20 cm, virtual, upright and diminished done clear
  C)
  On the right side, 30 cm, real, inverted and magnified done clear
  D)
  On the right side, 20 cm, virtual, up- right and diminished done clear
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• question_answer21)
  A camera uses a converging lens to produce an image on the film. If the focal length of the lens is 10 cm, where can an object be placed from the camera for taking a photograph?
  A)
  10 cm                                   done clear
  B)
  15 cm   done clear
  C)
  25 cm                                   done clear
  D)
  None of the above done clear
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• question_answer22)
  When is refraction of light NOT possible?

  (i) The angle of incidence is \[0{}^\circ \].

  (ii) The two media have the same refractive index.

  (iii) The refractive index is higher than 3.0.

  A)
  Only (i) and (ii) done clear
  B)
  Only (ii) and (iii)               done clear
  C)
  Only (i) and (iii)                done clear
  D)
  (i), (ii) and (iii) done clear
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• question_answer23)
  Which of the following does NOT affect the focal length of a convex lens?
  A)
  Refractive index of the material for making the lens done clear
  B)
  Material of the lens done clear
  C)
  Object distance done clear
  D)
  Thickness of the lens done clear
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• question_answer24)
  In an experiment to determine the focal length of a converging lens, the object distance and the image distance recorded were 20 cm and 30 cm respectively. What is the focal length of the converging lens?
  A)
  10 cm                   done clear
  B)
  12 cm                   done clear
  C)
  15 cm                   done clear
  D)
  18 cm done clear
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• question_answer25)
  During the refraction of light, which of the following quantities remains constant?
  A)
  Wavelength      done clear
  B)
  Speed                  done clear
  C)
  Frequency                         done clear
  D)
  Both (a) and (b) done clear
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• question_answer26)
  A converging lens magnifies a real image to four times its original size. Given that the focal length of the converging lens is 20 cm. what is the object distance?
  A)
  5 cm                                      done clear
  B)
  25 cm                   done clear
  C)
  40 cm                                    done clear
  D)
  100 cm done clear
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• question_answer27)
  A converging lens magnifies a virtual image to four times its original size. Given that the focal length of the converging lens is 20 cm, what is the object distance?
  A)
  5 cm                                      done clear
  B)
  10 cm                   done clear
  C)
  15 cm                                   done clear
  D)
  25 cm done clear
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• question_answer28)
  A concave mirror is made by cutting a portion of a hollow glass sphere of radius 24 cm. Find the focal length of the mirror.
  A)
  24 cm                                   done clear
  B)
  12 cm                   done clear
  C)
  6 cm                                      done clear
  D)
  18 cm done clear
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• question_answer29)
  At which of the following positions do the given mirrors form a virtual image?
  A)
  In convex mirror at infinity done clear
  B)
  In concave mirror between F and P done clear
  C)
  In plane mirror at all positions done clear
  D)
  All the above done clear
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• question_answer30)
  An object is placed at the centre of the curvature of a concave mirror. What is the distance between its image and the pole?
  A)
  Equal to f done clear
  B)
  Between f and 2 f done clear
  C)
  Equal to 2 f done clear
  D)
  Greater than 2 f done clear
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• question_answer31)
  A ray of light is incident on a concave mirror. If it is parallel to the principal axis, what happens to the reflected ray?
  A)
  It will pass through the pole. done clear
  B)
  It will pass through the centre of curvature. done clear
  C)
  It will pass through the focus. done clear
  D)
  It will retrace its path. done clear
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• question_answer32)
  What is the distance between a real object and its real image in the case of a concave mirror, when the object is placed at the centre of curvature?
  A)
  f             done clear
  B)
  2f                           done clear
  C)
  4f                                           done clear
  D)
  Zero done clear
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• question_answer33)
  Which of the given mirrors can be used to get an image larger than the object?
  A)
  A convex mirror done clear
  B)
  A concave mirror done clear
  C)
  Either a convex or a concave mirror done clear
  D)
  A plane mirror done clear
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• question_answer34)
  If an incident ray passes through the centre of curvature of a concave mirror, what happens to the reflected ray?
  A)
  It will pass through the pole of the mirror. done clear
  B)
  It will pass through the focus of the mirror. done clear
  C)
  It will retrace its path. done clear
  D)
  It will be parallel to the principal axis. done clear
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• question_answer35)
  Identify a mirror which neither converges or diverges a parallel beam of light rays falling on it.
  A)
  Plane mirror done clear
  B)
  Convex mirror done clear
  C)
  Concave mirror done clear
  D)
  Convexo-Concave mirror done clear
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• question_answer36)
  Where should an object be placed so that a real and inverted image of the same size is formed by a convex lens?
  A)
  At infinity done clear
  B)
  At the focus of the lens done clear
  C)
  At twice its focal length done clear
  D)
  Between f and the lens done clear
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• question_answer37)
  If a real object is placed in front of a convex lens of focal length 'f' at its principal focus, where is the image formed?
  A)
  At zero done clear
  B)
  At infinity done clear
  C)
  At a distance of 2f done clear
  D)
  At a distance f/2 done clear
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• question_answer38)
  Which of the following always produces a diminished image of an object?
  A)
  A convex mirror done clear
  B)
  A concave mirror done clear
  C)
  A convex lens done clear
  D)
  Bi-convex lens done clear
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• question_answer39)
  A monochromatic beam of light passes from a denser medium into a rarer medium. What is the result?
  A)
  Its velocity increases. done clear
  B)
  Its velocity decreases. done clear
  C)
  Its frequency decreases. done clear
  D)
  Its wavelength increases. done clear
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• question_answer40)
  In which mirror does one find the image long and thin?
  A)
  Concave mirror done clear
  B)
  Convex mirror done clear
  C)
  Cylindrical mirror done clear
  D)
  Parabolic mirror done clear
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• question_answer41)
  By using which of the following mirrors can you burn a piece of paper using the reflected rays of the sun?
  A)
  A plane mirror done clear
  B)
  A concave mirror done clear
  C)
  A convex mirror done clear
  D)
  All of the above done clear
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• question_answer42)
  When sun rays are focussed with a convex lens, a sharp, bright spot is observed at its focus. What does this spot indicate?
  A)
  The real image of the sun done clear
  B)
  The virtual image of the sun done clear
  C)
  An optical illusion produced by the convex lens done clear
  D)
  The magnified image of the sun done clear
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• question_answer43)
  Which of the following statements is NOT correct?
  A)
  A medium with larger refractive index is optically denser than a medium with smaller refractive index. done clear
  B)
  The speed of light is less in a rarer medium than a denser medium. done clear
  C)
  Refraction is due to the change in speed of light as it enters from one medium to another. done clear
  D)
  The absolute refractive index of a medium is simply called its refractive index. done clear
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• question_answer44)
  A ray of light is incident on a plane mirror at an angle of incidence \[30{}^\circ \] to the normal. With what angle is the ray deviated, after reflection?
  A)
  \[\text{3}0{}^\circ \]                                      done clear
  B)
  \[\text{6}0{}^\circ \]                      done clear
  C)
  \[\text{9}0{}^\circ \] done clear
  D)
  \[\text{12}0{}^\circ \] done clear
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• question_answer45)
  Only one of the following applies to a concave lens. Identify it.
  A)
  The focal length is positive. done clear
  B)
  The object distance can be positive or negative. done clear
  C)
  The height of the image can be positive or negative. done clear
  D)
  Image distance is always negative. done clear
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• question_answer46)
  In which of the following is the focal length always positive?
  A)
  Plane mirror      done clear
  B)
  Concave lens    done clear
  C)
  Convex lens      done clear
  D)
  All of the above done clear
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• question_answer47)
  Which of the following lens would you prefer to use while reading small letters found in a dictionary?
  A)
  A convex lens of focal length 50 cm. done clear
  B)
  A concave lens of focal length 50 cm. done clear
  C)
  A convex lens of focal length 5 cm. done clear
  D)
  A concave lens of focal length 5 cm. done clear
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• question_answer48)
  A ray of light travels from water to glass as shown below. The refractive index of water is 1.3 and the refractive index of glass is 1.5. What is the angle of refraction?
  A)
  \[\text{3}0.\text{7}{}^\circ \]                                    done clear
  B)
  \[\text{35}.\text{3}{}^\circ \]                    done clear
  C)
  \[\text{41}.\text{7}{}^\circ \]                                    done clear
  D)
  \[\text{48}.\text{6}{}^\circ \] done clear
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• question_answer49)
  Two light rays travelling parallel to the principal axis strike a converging lens and meet at a point as shown. Which point is called the focal point?
  A)
  R                                            done clear
  B)
  P                            done clear
  C)
  Q                                            done clear
  D)
  S done clear
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• question_answer50)
  An incident ray strikes a rectangular glass block as shown below. Which of the given emergent rays is the correct one?
  A)
  \[{{E}_{1}}\]                                      done clear
  B)
  \[{{E}_{2}}\]      done clear
  C)
  \[{{E}_{3}}\]                                      done clear
  D)
  \[{{E}_{4}}\] done clear
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