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A converging lens has a focal length of ...

A converging lens has a focal length of 20 cm in air. It is made of a material of refractive index 1.6. If it is immersed in a liquid of refractive index 1.3, what will be the new focal length?
How does the nature of the lens change. If this lens is immersed is a liquid of refractive index 1.8 ?

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