An optician prescribes a corrective lens of p | vedclass

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(B) The power $P$ of a lens in diopters $(D)$ is related to its focal length $f$ in meters $(m)$ by the formula: $P = \frac{1}{f(m)}$.Alternatively, i

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$50 \,cm$

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(B) The power $P$ of a lens in diopters $(D)$ is related to its focal length $f$ in meters $(m)$ by the formula: $P = \frac{1}{f(m)}$.Alternatively, if the focal length is in centimeters $(cm)$, the formula is: $P = \frac{100}{f(cm)}$.Given that the power $P = +2.0 \,D$, we substitute this into the formula:$2.0 = \frac{100}{f(cm)}$$f(cm) = \frac{100}{2.0} = 50 \,cm$.Therefore, the focal length of the required convex lens is $50 \,cm$.

An optician prescribes a corrective lens of power $+2.0 \,D$. The focal length of the required convex lens is:

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