how is power of a lens related to its focal length?
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The power of a lens is its ability to bend light – the greater the power the greater the refraction of light. The power of a lens is also related to the focal length by the following formula: Power of a lens is measured in Dioptres (D)
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Power of lens = 1/ focal length (in metre)
That is power of lens is the reciprocal of focal length in meter.
It's SI unit is diopter denoted by D.
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