Question

A convex lens made of class immersed in water. As a result it's focal length will

Answer 1

a convex lens made up of Glass when immersed in water then its power will be its one third times and so the focal length of the convex lens will be three times because it depend upon the refractive index

Answer 2

Multiply both with 10 and subtract it !! It’s focal length will be 152 - 133 = 19 !!

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