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

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

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Power of lens, P= 1/f 
P= -2D
f= -1/2 = -0.5 m
A concave lens has a negative focal length. Hence, it is a concave lens.

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asked Dec 15, 2021 in Light – Reflection and Refraction by Doubtly (98.9k points)

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