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  • Find the power of a concave lens of focal length 2 m.

Find the power of a concave lens of focal length 2 m.

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The focal length of the lens is f = -2 m. (The focal length of a concave lens is negative)

Power of the lens P is given by

\\P=\frac{1}{f}\\ P=\frac{1}{-2}\\ P=-0.5\ D

Power of the lens is - 0.5 Dioptre.

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