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Light Reflection and Refraction
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11/08/2021 12:30 pm
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An object is placed at a distance of 10 cm from a concave mirror of focal length 20 cm.
(a) Draw a ray diagram for the formation of image.
(b) Calculate the image distance.
(c) State two characteristics of the image formed.
1 Answer
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11/08/2021 12:32 pm
(a) figure.png
Formation of image by the concave mirror when the object is placed between its pole and focus.
(b) Here, 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.