Power of a lens is a measure of how strongly the lens converges or diverges light. It is the reciprocal of focal length in meters. A lens with power o
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What is the power of a lens?
The power of a lens is its ability to converge or diverge light. It is the reciprocal of the focal length measured in metres: P = 1/f.
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What is the unit of power of a lens?
The SI unit is the dioptre (D), where 1 D = 1 m⁻¹. A lens with a focal length of 1 metre has a power of 1 dioptre.
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Is the power of a convex lens positive or negative?
A convex (converging) lens has positive power; a concave (diverging) lens has negative power.
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