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

Q 16.     Find the focal length of a lens of power – 2.0 D. What type of lens is this?

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\\f=\frac{1}{P}\\ f=\frac{1}{-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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