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question_answer1) When a small plane mirror is placed horizontally on level ground at a distance of 60 m from the foot of a tower, the top of the tower and its image in the mirror subtend an angle of \[90{}^\circ \]at the eye, where eyes is placed at the mirror itself. Find the height (in meter) of the tower.
question_answer2) A point object is kept in front of a plane mirror. The plane mirror is doing SHM of amplitude 2 cm. The plane mirror moves along the x-axis and x-axis is normal to the mirror. The amplitude of the mirror is such that the object is always infront of the mirror. Find the amplitude (in cm) of SHM of the image.
question_answer3) A person's eye level is 1.5 m. He stands in front of 0.3 m long plane mirror which is 0.8m above the ground. The length (in cm) of the image he sees of himself is?
question_answer4) A spherical mirror forms an erect image three times the linear size of the object. If the distance between the object and the image is 80 cm, the focal length (in cm) of the mirror is?
question_answer5) A candle flame 3 cm high is placed at distance of 3 meters from a wall. How far (in cm) from the wall must a concave mirror be placed in order that it may form an image of the flame 9 cm high on the wall?
question_answer6) A ray is reflected in turn by three plane mirrors mutually at right angles to each other. The angle between the incident and reflected ray is .....in degree.
question_answer7) A concave mirror of focal length 20 cm is cut into two parts from the middle and the two parts are moved perpendicularly by a distance 1 mm from the previous principal axis AB. If an object is placed of a distance of 10 cm from the mirror on the line AB then, find the distance (in mm) between the images formed by the two parts?
question_answer8) If \[\theta =110{}^\circ \] then total number of images formed by the mirror system will be-
question_answer9) Rays of light strike a horizontal plane mirror at an angle of\[45{}^\circ \]. A second plane mirror is arranged at an angle \[\theta \]with it. If the ray after reflection from the second mirror goes horizontally parallel to the first mirror then \[\theta \] is (in degree)
question_answer10) A horizontal fluorescent tube is 80 cm in length. If a square horizontal plane mirror, of each side 20 cm, is placed below the tube at a distacne 200 cm from the tube, such that the perpendicular bisector of the length of the tube passes through the mid-point of the mirror and pair of the sides of the mirror are parallel to the length of the tube, the length of the reflected patch of light on the ceiling, 100 cm above the tube is \[85\times a\]cm the value of a is.
question_answer11) A square plane mirror 50 cm long is hung parallel to a vertical wall of a room, with its lower edge 50 cm above the ground. A man stands in front of the mirror at a distance 2m away from the mirror. If his eyes are at a height 2m above the ground, the length of the floor, visible to him reflected by the mirror is \[\frac{4}{a}m\], then value of a is.
question_answer12) Using a certain concave mirror, the magnification is found to be 4 times as great when the object was 25 cm from the mirror as it was with the object at 40 cm from the mirror, the image being real in each case. The focal length of the mirror is \[f\]cm. Determine the value of\[\frac{f}{10}\].
question_answer13) If the diameter of the sun is \[5.0\times {{10}^{6}}\]km and if its average distance from the earth is \[20.0\times {{10}^{8}}\]km, then calculate the size of its image in cm formed by a concave mirror of focal length 4 metre.
question_answer14) A point source S is placed midway between two converging mirrors having equal focal length \[f\]as shown in figure. The value of d, for which only one image is formed is\[Nf\]. Then value of N is.
question_answer15) Consider the situation shown in figure. The elevator is going up with an acceleration of\[2.00m/{{s}^{2}}\]and the focal length of the mirror is 12.0 cm. The entire surfaces are smooth and the pulley is light. The mass-pulley system is released from rest (with respect to the elevator) at \[t=0\]when the distance of B from the mirror is\[42.0cm\]. Find the distacne (in cm) between the image of the block B and the mirror at\[t=0.200s\]. Take\[g=10m/{{s}^{2}}\].
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