Question

choose the correct option and show working for 9th question

Answer 1

Option D : 10 cm

Explanation:

Hope u got answer

Answer 2

EXPLANATION

The radius of curvature of a concave lens is 20 cm.Its focal length will be?

The radius of curvature of a concave lens = 20

We have to find its focal

focal = half or 1/2

Therefore, the half of 20

= 20/2

=10/1

That =10

FINAL ANSWER

(d) 10cm

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