Question

two thin lenses of power +3.5D and - 2.5D are placed in contact with each other. find the power and focal length of the lens combination​

Answer 1

Answer:

power=P1+P2

3.5+(-2.5)

3.5-2.5

power=1D

power=1/f(in meter)

1=1/f

By cross multiplication

Focal length=1meter or 100cm

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Answer 2

Answer:

power of lens=1D

focal length=1 meter