What is the focal length of a convex lens hav | vedclass

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(D) The power $(P)$ of a lens is defined as the reciprocal of its focal length $(f)$ in meters,given by the formula: $P = \frac{1}{f(m)}$.Given,$P = +

Vedclass · Accepted Answer

$+20 \,cm$

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(D) The power $(P)$ of a lens is defined as the reciprocal of its focal length $(f)$ in meters,given by the formula: $P = \frac{1}{f(m)}$.Given,$P = +5.0 \,D$.Substituting the value in the formula: $5.0 = \frac{1}{f}$.Therefore,$f = \frac{1}{5.0} \,m = 0.2 \,m$.To convert the focal length into centimeters,multiply by $100$: $f = 0.2 	imes 100 \,cm = +20 \,cm$.Since the power is positive,the lens is a convex lens,and its focal length is positive.

What is the focal length of a convex lens having power $+5.0 \,D$?

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