JEE PHYSICS MCQ: RAY OPTICS

1 Medium

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Application +4 | -1

A thin biconvex lens of focal length

20 \mathrm{~cm}

is made of glass of refractive index 1.5. When it is dipped in a liquid of refractive index

\frac{9}{8}

, it acts as

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Correct option: A

Convex lens of focal length 30 cm

Option A (Convex lens of focal length 30 cm) is correct because the focal length changes when the lens is immersed in a liquid, and the new focal length is calculated using the lens maker's formula.

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In refraction, light waves are bent on passing from one medium to the second medium, because, in the second medium A double convex lens is made of glass which has its refractive index 1,45 for violet rays and 1.50 for red rays. If the focal length for violet ray is

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