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Question

When light enters from medium P to medium Q, it is given that the value of sin isin r is less than 1, where i and r are the angle of incidence and refraction respectively. This means that:

A

P is optically denser than Q

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B

Q is optically denser than P

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C

P and Q have same optical density

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D

P and Q are opaque.

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Solution

The correct option is A P is optically denser than Q Given: (sin isin r) < 1 ⇒ sin i < sin r ⇒ Angle of incidence < Angle of refraction. It means that when light ray travels from medium P to medium Q, the ray bends away from the normal. We know that when light ray travels from denser to rarer medium, it bends away from the normal. Hence, medium P is optically denser than Q.

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