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  3. 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?

Answers (1)
D Deependra Verma

\f=frac1P\ f=frac1-2\ f=-0.5 m\ f=-50 cm

The lens is concave because it's focal length is negative and is equal to -50 cm.

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