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The combination of a convex lens of power +2D and a concave lens of power -2D, acts as :

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A convex lens of power 4D

A concave lens of power -4D

Prism

A lens of power 0 D

answer is B.

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Detailed Solution

Power of concave lens = -2D
Power of convex lens = +2D

The effective power of combined lenses= Sum of the power of individual lenses

$∴$ Effective power = -2D + 2D = 0D

Therefore, the combination of the lens will act as a lens with power 0D.

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