Calculate the focal length of a reading glass of a person if this distance of distinct vision is 75 cm.

75.2 cm

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25.6 cm

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100.4 cm

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37.5 cm

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Solution

The correct option is D
37.5 cm

u = -25 cm

v = -75 cm

$\frac{1}{f} = - \frac{1}{u} + \frac{1}{v} \frac{1}{f} = \frac{1}{25} - \frac{1}{75} = \frac{2}{75} f = \frac{75}{2} = 37.5 c m$

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Calculate the focal length of a reading glass of a person if this distance of distinct vision is 75 cm.

The correct option is D 37.5 cm u = -25 cm v = -75 cm 1f=−1u+1v1f=125−175=275f=752=37.5 cm

The correct option is D
37.5 cm

u = -25 cm

v = -75 cm

$\frac{1}{f} = - \frac{1}{u} + \frac{1}{v} \frac{1}{f} = \frac{1}{25} - \frac{1}{75} = \frac{2}{75} f = \frac{75}{2} = 37.5 c m$