NEET Physics Question - Ray Optics

Assertion (A): When light passes through a prism, it disperses while if the same light passes through a rectangular glass slab of same material, it doesn't disperse.

Reason (R): Dispersive power of prism is non zero while that of glass slab is zero.

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Solution:

A prism disperses light because its non-parallel surfaces separate colors due to varying refractive indices. A rectangular slab also disperses light internally, but the emergent rays are parallel, resulting in no net angular dispersion. Dispersive power is a material property and is non-zero for any dispersive medium, including glass slabs.

Rankers Physics

Dispersion by Prism vs. Slab

Solution:

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