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प्रश्न
A lens mentioned in convex lens has a focal length of 25 cm. Calculate the power of the lens.
संख्यात्मक
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उत्तर
Given: f = 25 cm = 0.2 m
Power of a lens is:
\[ P=\frac{1}{f} \]
= \[\frac{1}{0.25}\]
= 4 D
Since the lens is a convex lens, its power is positive.
P = +4 D
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