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Light Reflection and Refraction
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18/08/2021 12:40 pm
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Determine how far an object must be placed in front of a converging lens of focal length 10 cm in order to produce an erect (upright) image of linear magnification 4.
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18/08/2021 12:43 pm
f = 10 cm
m = +4 (upright image)
m = \(\frac{v}{u}\) = 4
v = 4u
\(\frac{1}{v}\) - \(\frac{1}{u}\) = \(\frac{1}{f}\)
\(\frac{1}{4u}\) - \(\frac{1}{u}\) = \(\frac{1}{10}\)
\(\frac{-3}{4u}\) = \(\frac{1}{10}\)
u = -7.5 cm
The object must be placed 7.5 cm in front of the converging lens.