Question

A convex lens of focal length 10 cm is made of glass of refractive index 1.5. What is the focal length when it is immersed in a liquid of refractive index 1.8?

Answer 1

Answer -

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• A convex lens of refractive index 1.5 has a focal length of 18 cm in air. Calculate the change in its focal length when it is immersed in water of refractive index 4/3. Given, a convex lens. Hence, focal length changes from 18 to 32.

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