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A thin bi-convex lens of focal length 20 cm is made of glass of refractive index 1.5. When it is dipped in a liquid of refractive index 9/8​, it acts as a:

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1 Answer

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The focal length of a lens is given by the formula, 

Since the focal length is coming out to be positive. It behaves like a convex lens of focal length 30 cm.

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