When is the magnitude of the power of a lens | vedclass

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(B) The power $(P)$ of a lens is defined as the reciprocal of its focal length $(f)$ in metres, given by the formula $P = \frac{1}{f(in \, m)}$.For th

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When the focal length is $1 \, m$

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(B) The power $(P)$ of a lens is defined as the reciprocal of its focal length $(f)$ in metres, given by the formula $P = \frac{1}{f(in \, m)}$.For the magnitude of the power to be equal to the magnitude of the focal length, we set $P = f$.Substituting this into the formula, we get $f = \frac{1}{f}$.This implies $f^2 = 1$, so $f = 1 \, m$ (since focal length is a physical distance).Therefore, the magnitude of the power of a lens is equal to its focal length when the focal length is $1 \, m$.

When is the magnitude of the power of a lens equal to its focal length?

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