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Light Reflection and Refraction
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17/08/2021 4:11 pm
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A convex lens produces an inverted image magnified three times of an object placed at a distance of 15 cm from it. Calculate focal length of the lens.
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17/08/2021 4:14 pm
m = -3 (Inverted image)
u = -15 cm
m = \(\frac{v}{u}\)
-3 = \(\frac{v}{-15}\)
v = 45 cm
\(\frac{1}{45}\) - \(\frac{1}{-15}\) = \(\frac{1}{f}\)
\(\frac{1 + 3}{45}\) = \(\frac{1}{f}\)
f = \(\frac{45}{4}\) cm
f = 11.25 cm