Physics
Assertion (A): When a ray of light is refracted through a rectangular glass slab, there is no dispersion of light.
Reason (R): Dispersion of light is the phenomenon of splitting of white light into its constituent colours.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true and R is not the correct explanation of A.
- assertion is false but reason is true.
- assertion is true but reason is false.
Spectrum
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Answer
Both A and R are true and R is the correct explanation of A.
Explanation
Assertion (A) is true. When a ray of light passes through a rectangular glass slab, there is no dispersion of light. After refraction at two parallel faces of a glass slab, the ray of light emerges in a direction parallel to the incident ray. As rays of all colours emerge in the same direction as incident ray, hence there is no dispersion, but only lateral displacement
Reason (R) is true. Dispersion of light is the phenomenon of splitting of white light into its constituent colors.
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