If the power of a lens is – 2 D, what is its focal length?

If the power of a lens is – 2 D, what is its focal length?

Q. If the power of a lens is – 2 D, what is its focal length?

A.            +50 cm

B.            -100 cm

C.            -50 cm

D.            +100 cm

Answer: -50 cm

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