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Light Reflection and Refraction
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13/08/2021 2:14 pm
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An object is placed 15 cm from (a) a converging mirror, and (b) a diverging mirror, of radius of curvature 20 cm. Calculate the image position and magnification in each case.
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13/08/2021 2:16 pm
(a) figure.png
Fig. Formation of image by the concave mirror when the object is placed between its pole and focus
(b) f = -20 cm, u = -10 cm, v = ?
We know that
\(\frac{1}{v}\) + \(\frac{1}{u}\) = \(\frac{1}{f}\)
\(\frac{1}{v}\) + \(\frac{1}{-10}\) = \(\frac{1}{-20}\)
\(\frac{1}{v}\) = - \(\frac{1}{20}\) + \(\frac{1}{10}\)
= \(\frac{1}{20}\)
∴ v = 20 cm
(c) Characteristics of image formed
(i) Image is virtual.
(ii) Image is erect.