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Explain me power of lens

Answers

Answer by Divya Garg

The power of a lens is its ability to bend light – the greater the power the greater the refraction of light. The +ve sign of the power indicates that the lens is a converging lens or convex lens, whereas the negative sign of the power indicates that the lens is concave or diverging lens. The S.I unit of the power is Dioptre or 1/metre. Power = 1/focal length (in m).