An object 4 cm in size, is placed at 20 cm in front of a concave mirror of focal length 10 cm What distance from the mirror should a screen be placed in order to get a sharp image?
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since focal length of the mirror is 10cm and object is placed at 20cm hence the object is placed at centre of curvature
distance of screen(v) = -20cm
draw the ray diagram it will prove the answer completely
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