Assertion :Width of the beam is increased in going from in air to water. Reason: Rays of light diverge when they go from one medium to another.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
According to Snell's law, when a beam of light travels from a rarer medium (air) to a denser medium (water), it bends towards the normal. Since the edge away from the water is still moving at a faster speed, the wavefront swings around and becomes more parallel to the surface. This makes the direction of motion more parallel to the normal. Hence, the width of the beam increases.

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