How will you decide whether a given piece of glass is a concave lens,

1.	How will you decide whether a given piece of glass is a concave lens, convex lens or a plane glass plate?
Answer» Hold the given piece of glass over some printed number: (i) If the letter appear magnified, the given piece is a convex lens. (ii) If the letters appear diminished, the given piece is a concave lens. (iii) If the letters appear to be of the same size, then it is a plane glass mirror.

How will you decide whether a given piece of glass is a concave lens, convex lens or a plane glass plate?

Answer»

Hold the given piece of glass over some printed number:

(i) If the letter appear magnified, the given piece is a convex lens.

(ii) If the letters appear diminished, the given piece is a concave lens.

(iii) If the letters appear to be of the same size, then it is a plane glass mirror.