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Combinations of Lenses & Mirrors

25.Glass lens...

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25.Glass lens of refractive index 1.5 of focal length 20cm in air is dipped in water(refractive index=4/3). New focal length of the lens inside water is

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Q. Focal length of a converging lens air in

R

. If it is dipped in water of refractive index

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Q. Find the new focal length of a convex lens of focal length

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and refractive index

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[refractive index of the water is

\frac{4}{3}

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Q. A thin lens of refractive index 1.5 has a focal length 15 cm in air. When the lens is placed in a medium of refractive index 4/3, what is the new focal length?

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