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A focal length of a lens is \( 10 \mathrm{~cm} \). What is power of a lens in dioptre ?
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\( 10 \mathrm{D} \)
Given, focal length \( =10 \mathrm{~cm}=10 \times 10^{-2}=0.1 \mathrm{~m} \)
Power of lens \( =\frac{1}{f}=\frac{1}{0.1}=1 \) dioptre
Thus, power of lens in dioptre is \( 10 \mathrm{D} \)
Power of lens \( =\frac{1}{f}=\frac{1}{0.1}=1 \) dioptre
Thus, power of lens in dioptre is \( 10 \mathrm{D} \)
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