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If a person uses a lens of -2.5 D power, then the focal length of the lens is ……………………

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If a person uses a lens of -2.5 D power, then the focal length of the lens is …………………… 

A) 40 cm 

B) 50 cm 

C) -40 cm

D) -50 cm

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1 Answer

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by (36.7k points)

Correct option is  C) -40 cm

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