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प्रश्न
The number of the glasses of a person is +0.75 D. What is the nature of the lens and what is its focal length?
संख्यात्मक
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उत्तर
(i) As the power is +0.75 D, therefore the lens is convex.
\[ \text{(ii) Applying, } \mathrm{P} = \frac{100}{f \text{(in cm)}} \]
\[ \Rightarrow 0.75 = \frac{100}{f \text{(in cm)}} \]
\[ \Rightarrow f \text{(in cm)} = \frac{100}{0.75} \]
\[ \therefore \ f = + \ 133.33 \ \text{cm} \]
Thus, the focal length of the lens is 133.33 cm.
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