Question

The refractive index of the material of a concave lens is It is immersed in a medium of refractive index . A parallel beam of light is incident on the lens. The path of the emergent rays when is :

A
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B
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C
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D
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Medium
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Solution

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Correct option is A)

From the laws of optics, we know that a lens reverses its behaviour when placed in a medium of higher refractive index. Hence, a concave lens diverges light in general, but when placed in a medium of higher refractive index it converges parallel rays of light to a focal point.

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