Two lenses having powers +2D and -4D respectively are put together. Power of the combination would be

-2D

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+2D

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-4D

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+4D

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Solution

The correct option is A
-2D

P₁+ P₂ = +2D + (-4D) = -2 D

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Similar questions

Two lenses with powers; 2D & -4D are kept together. What is the effective focal length of the combination?

+ 4 D

- 2 D

4 D

- 2 D

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