Question

Combination of two lenses with powers +2d and -4d resultant power is

Answer 1

The Answer is -2D
+2D+(-4D)=+2D-4D=-2D

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Answer 2

Hey !

           P = P₁ + P₂ = 2D + ( - 4 D )

    = 2D - 4D

    = - 2D

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