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Light Reflection and Refraction
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18/08/2021 12:32 pm
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A convex lens of focal length 6 cm is held 4 cm from a newspaper which has print 0.5 cm high. By calculation, determine the size and nature of the image produced.
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18/08/2021 12:38 pm
f = 6 cm
u = -4 cm
\(h_1\) = 0.5 cm
\(\frac{1}{v}\) - \(\frac{1}{u}\) = \(\frac{1}{f}\)
\(\frac{1}{v}\) - \(\frac{1}{-4}\) = \(\frac{1}{6}\)
\(\frac{1}{v}\) = \(\frac{1}{6}\) - \(\frac{1}{4}\)
= \(\frac{2 - 3}{12}\)
m = \(\frac{v}{u}\) = \(\frac{h_2}{h_1}\)
\(\frac{-12}{-4}\) = \(\frac{h_2}{0.5}\)
\(h_2\) = 1.5 cm
Image is 1.5 cm high, virtual, erect and magnified.