Question

A concave and a convex lens are placed on a sheet of newspaper . How will you identify them without touching?

Answer 1

Dear Student

Without touching we can identify two different lenses by looking at the size of the letters of newspaper just below the lenses.

If the image of the letters is larger then it is a convex lens because convex lens produces enlarged image .

If the image of letters is smaller than the letters then it is concave lens because concave lens produces diminished image.

Regards