Define ‘power of a lens’.

1.	Define ‘power of a lens’.
Answer» The power of a lens is the reciprocal of its focal length in metre. It may also be defined as the power of convergence or divergence of a lens. If f is the focal length of a lens in metre and P is the power of the lens. Then: P = 1/f(in metre).

Answer»

The power of a lens is the reciprocal of its focal length in metre. It may also be defined as the power of convergence or divergence of a lens. If f is the focal length of a lens in metre and P is the power of the lens. Then:

P = 1/f(in metre).

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Define ‘power of a lens’.

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