A combination of two lenses with power 1D and 2D is there what is the total power

5 D

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2 D

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3 D

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1 D

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Solution

The correct option is C
3 D

If two thin lenses of power p₁ and p₂ are held in contact then the power of the combination will be

p = p1 +p₂

p = 1D + 2D

p = 3D

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