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प्रश्न
The power of the lens of a myopic person is −3.75 D. Calculate the focal length of the lens.
संख्यात्मक
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उत्तर
Power −3.75 D indicates that lens is concave.
\[ \text{Applying, } \mathrm{P} = \frac{100}{f \text{(in cm)}} \]
\[\Rightarrow \ - \ 3.75 = \frac{100}{f \text{(in cm)}}\]
\[ \ f = -\frac{100}{3.75} \]
\[\therefore\ f = - \ 26.67 \ \text{cm}\]
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