First slide

The optical instruments

Question

To remove myopia (short sightedness) a lens of power 0.66 D is required. The distant point of the eye is approximately

Moderate

A

100 cm
B

150 cm
C

50 cm
D

25 cm

Solution

Far point of the eye = focal length of the lens
$= \frac{100}{P} = \frac{100}{0 .66} = 151$ cm

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