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Common Rays in Thin Lenses

Under what co...

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Under what condition a convex lens when placed in a medium acts as a ordinary glass plate?

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Q. Under what condition does a biconvex lens of glass having a certain refractive index act as a plane glass sheet when immersed in liquid?

Q. Under what conditions will a glass lens placed in a transparent liquid becomes visible?

Q. A biconcave symmetric lens is placed inside a medium whose refractive index is

n_{m e d i u m}

with respect to the air. The lens acts as a converging lens (convex lens) in this medium. So what can you say about the refractive index of the lens (

n_{l e n s}

) with respect to the air?

Q. The focal length of a convex lens made of glass is 20 cm. What will be its new focal length when placed in a medium of refractive index 1.25 ?

Q. Under what conditions will a glass lense place in a transparent liquid become invisible?

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Common Rays in Thin Lenses

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