Pencil, 10 cm in size, is placed at 25.0 cm in front of a concave mirror of focal length 15.0 cm. at what distance from the mirror should a screen be placed in order to obtain a sharp image? find the nature and the size of the image.
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Negative sign indicates that the image is in front of the mirror. Therefore, the screen must be placed in front of the mirror at a distance of 37.5 cm.
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