Question

How will you distinguish between a convex and a concave lens without touching them? 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.
for rockstar​

Answer 1

Explanation:

Convex lens is converging lens so it converges

concave lens is diverging lens

Answer 2

Light - Reflection and Refraction

How will you distinguish between a convex and a concave lens without touching them? 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.