Assertion: Refraction of white light through a prism gives rise to dispersion.

Reason: Both the refracting surface of the glass slab are parallel to each other. But the refracting surfaces of the prism are inclined to an angle called the angle of prism.

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Both assertion and reason are true and the reason is the correct explanation of assertion

Both assertion and reason are true, but the reason is not the correct explanation of assertion

If the assertion is true, but the reason is false

If the assertion is false, but the reason is true

answer is B.

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Detailed Solution

Both assertion and reason are true, but the reason is not the correct explanation of assertion.
Assertion: The light rays travel with different wavelengths and also have different speeds. Refraction of white light through a prism happens because the light of different wavelength bends at different angles as the refractive index for each colour is different. This is called dispersion.
Reason: The angle formed by two surfaces is known as the refracting angle of the prism angle. A ray of light undergoes two refractions in a prism, resulting in deviation. In simple words, whenever passing through the prism, the ray of light deviates from its original path by a specific angle.

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