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प्रश्न
A nearsighted person cannot clearly see beyond 200 cm. Find the power of the lens needed to see objects at large distances.
थोडक्यात उत्तर
उत्तर
For a near-sighted person, u = ∞.
Now, we have:
v = – 200 cm = – 2 m
The lens formula is given by
`1/v -1/u =1/f`
On putting the respective values, we get:
`1/f = 1/((-2)) -1/∞ =-1/2`
∴ The power of the lens = `1/f`= -0.5 D
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