The power of a lens is 2.5 dioptre. What is t | vedclass

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(A) The power of a lens is given by the formula $P = \frac{1}{f}$,where $f$ is the focal length in meters.Given,power $P = 2.5 	ext{ D}$.Substituting

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$40 	ext{ cm}$,convex lens

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(A) The power of a lens is given by the formula $P = \frac{1}{f}$,where $f$ is the focal length in meters.Given,power $P = 2.5 	ext{ D}$.Substituting the value in the formula: $2.5 = \frac{1}{f}$.Therefore,$f = \frac{1}{2.5} 	ext{ m} = 0.4 	ext{ m}$.Converting meters to centimeters: $0.4 	ext{ m} = 0.4 	imes 100 	ext{ cm} = 40 	ext{ cm}$.Since the power is positive $(+2.5 	ext{ D})$,the focal length is also positive,which indicates that the lens is a convex lens.

The power of a lens is $2.5$ dioptre. What is the focal length and the type of lens?

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