An object is placed in front of a concave mirror at a distance of 10 cm. The focal length of the mirror is 20 cm. At what distance from the mirror should a screen be kept so as to get a clear image. *
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In this case the focal length of concave mirror is 10 cm. This means that the focus (F) of this concave mirror is at a distanace of 10 cm from the mirror and its centre of curvature ( C) is at a distance of 2×10=20cm form the mirror.
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Answer:
15 cm.
Explanation:
A magnified real image is formed by a concave mirror when the object is between F and C. Here F is at 10 cm and C is at 20 cm. So, the magnified real image will be formed when the object is at a distance btween 10 cm and 20 cm, which in this problem is 15 cm.
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