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What does 'P' represent in lens power calculations?

f, focal length of lens (m)

A, area of the lens

D, dioptres

In lens power calculations, 'P' represents the power of a lens, which is measured in dioptres. This unit of measurement indicates the ability of the lens to converge or diverge light rays. The formula for calculating lens power is given by P = 1/f, where 'f' is the focal length of the lens in meters. Since the focal length is in the denominator, a shorter focal length results in a higher lens power, indicating that the lens has a stronger ability to bend light. Thus, when referring to 'P' in this context, it is directly correlated to dioptres, making option C the correct choice.

The other choices provide alternate definitions that do not accurately represent what 'P' signifies in this context. The focal length, area of the lens, and radius of curvature are relevant to the design and characteristics of lenses but do not define or replace the term for lens power itself.

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r, radius of curvature

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