Question

how will you identify a convex lens by toughing it​

Answer 1

Answer:

Convex and concave lens can be distinguished by touching them. If the curved surface is bulging outwards then it's convex lens and if the curved surface is curved inwards then it's concave lens.

Explanation:

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Answer 2

Answer:

Convex lenses are thinner at the edges and thicker in the middle. It bulges out at its centre. When kept on a plane surface its edges do not touch the surface...

thus one can identify it easily by touching it or without touching it(i.e keeping on a plane surface)..