The focal length of a concave mirror is 10cm. The position of the object that is useful for getting an enlarged image which can be caught on a screen is
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To get a enlarged image of the object on aa screen if the concave mirror has a focal length of 10 cm, the screen must be placed within the centre of curvature.
R=2f
R=2(10)
R=20cm.
So screen must be placed within 20 cm from the mirror.
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