7. State two differences between a convex and a concave lens.

Answers (1)

The basic difference between the two are given below:- 

(i) In the case of a convex lens, it converges the falling rays of light whereas in the case of the concave lens the rays diverge.

(ii) A concave lens has thick edges and is thin at the middle but the convex lens is thick at the middle.

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