Find the focal length of a lens of power -2.0 D. what type of lens is this? 

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Muskan Anand

2 years ago

Given that power of lens P = -2.0 D As power P=1fP=1f, hence focal length of lens f=1P=1−2.0D=−0.5mf=1P=1-2.0D=-0.5m The -ve sign of focal length means that the lens is a concave lens.

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