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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 a 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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