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A converging lens of focal length 5cm is used as a magnifying glass by a ma...


Question

A converging lens of focal length 5cm is used as a magnifying glass by a man whose nearpoint is 35cm. Calculate the magnification given by the lens

Options

A) 8

B) 7

C) 6

D) 5

E) 4

Explanation:

\(\frac{1}{f} = \frac{1}{u} + \frac{1}{v}\)

= \(\frac{1}{5} - \frac{1}{35} = \frac{30}{175}\)

U = \(\frac{175}{30}\) = 5.8m

\(\frac{v}{u} = \frac{35}{5.8}\)

= 6


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Dicussion (1)

  • \(\frac{1}{f} = \frac{1}{u} + \frac{1}{v}\)

    = \(\frac{1}{5} - \frac{1}{35} = \frac{30}{175}\)

    U = \(\frac{175}{30}\) = 5.8m

    \(\frac{v}{u} = \frac{35}{5.8}\)

    = 6

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