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question_answer1) Directions (Q. No. 1 to 7): In the following questions, A statement of Assertion is followed by a statement of Reason (R). Mark the correct choice as. Assertion (A): According to Huygens theory no back-ward wavefront is possible. Reason (R): Amplitude of secondary wavelets is proportional to\[\left( 1+\cos \theta \right)\], where \[\theta \] is the angle between the ray at the point of consideration and direction of secondary wavelet.
question_answer2) Assertion (A): Wavefront emitted by a point source of light in an isotropic medium is spherical. Reason (R): Isotropic medium has same refractive index in all directions.
question_answer3) Assertion (A): When a light wave travels from rarer to denser medium, its speed decreases. Due to this reduction of speed the energy carried by the light wave reduces. Reason (R): Energy of wave is proportional to the frequency.
question_answer4) Assertion (A): No interference pattern is detected when two coherent sources are too dose to each other. Reason (R): The fringe width is inversely proportional to the distance between the two slits.
question_answer5) Assertion (A): For best contrast between maxima and minima in the interference pattern of Young's double slit experiment, the amplitudes of light waves emerging from the two sources should be equal. Reason (R): For interference, the sources must be coherent.
question_answer6) Assertion (A): Fringes of interference pattern produced by blue light is narrower than that produced by red light. Reason (R): In Young's double slit experiment, fringe width = \[\lambda \operatorname{D}/d\]
question_answer7) Assertion (A): Diffraction takes place with all types of waves. Reason (R): Diffraction is perceptible when the wavelength of the wave is comparable to the dimension of the diffracting device.
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