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If D1 and D2 are the powers of the compo...

If `D_1 and D_2` are the powers of the component lenses and D is the power of the lens combination then

A

`D = D_1 + D_2`

B

`D = (frac(D_1+D_2)(2))`

C

`D = )frac(D_1D_2)(D_1 + D_2)`

D

`D = (frac(D_1D_2)(D_2 - D_1))`

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