Question

a convex lens is dipped in a liquid whose refractive index is equal to refractive index of material of lens then it's focal length will be

Answer 1

a convex lens is thick at middle and thin at the edges.
a convex lens is alsouesd as a magnifying glass.
how much i know i have tried.
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Answer 2

Answer:

Its focal length will become infinite.

Explanation:

Using lens makers formula we can derive that 1/f=0, which concludes that the focal length tends to infinity.

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