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प्रश्न
Calculate the power of a convex lens of focal length 12.5 cm.
संख्यात्मक
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उत्तर
\[ \text{Applying, } \mathrm{P} = \frac{100}{f \text{(in cm)}} \]
\[= \frac{100}{12.5}\]
= +8D
Thus, power is +8D. The positive sign shows that lens is convex.
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