Answer :

Power of lens = .

Focal length =


1m = 100 cm.


0.2 m = 0.2 × 100 = 20 cm.


Focal length = 20 cm. (Positive for convex lens.)


Option (A): since focal length is positive for convex lens. Therefore, Option A is incorrect.


Option (B): since focal length is positive for convex lens. Therefore, Option B is incorrect.


Option (C): focal length is 20 cm not 10 cm therefore option (C) is incorrect.


Option (D): as explained in explanation focal length = + 20 cm therefore option D is correct.

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