Question

You are given two lenses of equal size concave and convex how will you distinguish them without touching their surfaces

Answer 1

convex is puffed out concave is curved...

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Answer 2

Two lenses of equal size concave and convex given us we distinguish between them by touching if the lens is blugging outword it means it is a convex lens and if the lens is blugging inword it means is a concave lens.

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