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प्रश्न
The focal length of the glasses of a short sighted person is 37.5 cm. Calculate the power of the glasses and their nature.
संख्यात्मक
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उत्तर
As the person is short sighted the lens of his glasses is concave.
Applying, \[ \mathrm{P} = \frac{100}{f \text{(in cm)}}\]
\[= \frac{100}{-37.5}\]
= −2.67 D
Minus sign indicates that the lens is concave in nature.
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