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Question
Assertion (A): There is no dispersion of light refracted through a rectangular glass slab.
Reason (R): Dispersion of light is the phenomenon of splitting a beam of white light into constituent colours.
Assertion (A): There is no dispersion of light refracted through a rectangular glass slab.
Reason (R): Dispersion of light is the phenomenon of splitting a beam of white light into constituent colours.
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Solution
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After refraction at two parallel faces of a glass slab, a ray of light emerges in a direction parallel to the incidence of white light on the slab.
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As rays of all colours emerge in the same direction (of incidence of white light), hence there is no dispersion, but only lateral displacement.
Hence, the correct answer is: A and R are true, and R is not the correct explanation of A
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After refraction at two parallel faces of a glass slab, a ray of light emerges in a direction parallel to the incidence of white light on the slab.
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As rays of all colours emerge in the same direction (of incidence of white light), hence there is no dispersion, but only lateral displacement.
Hence, the correct answer is: A and R are true, and R is not the correct explanation of A
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