A convex lens of focal length 40 cm and a concave lens of focal length 200 cm are placed in contact with each other. Find the power of the combined lens.
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A convex lens of focal length 40 cm and a concave lens of focal length 200 cm are placed in contact with each other. Find the power of the combined lens.

a) 2 D

b) 3 D

c) 1.5 D

d) 2.5 D
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Best Answer

The the correct option of this question is (A).

Explanation : On calculation we find that the combined power of lens is 2D.

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