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| 1. |
Power of the lens=p=I/f |
| Answer» Solution :The FOCAL length of a lens is f then its reciprocal (I/t) is CALLED the power of the lens. So Power of the lens = p = 1/f. When f is measured in metres then power of the lens is in dioptres. the unit of power "dioptre" is DEFINED as the power of a lens of focal-length one metre. Its SYMBOL is .D.. | |