A needl 1.5 cm is placed at a distance of 20 cm from a concave mirror of focal length 15 . What is nature and size of image . If the needle is moved closer to the mirror,how would the screen have to be moved
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A needl 1.5 cm is placed at a distance of 20 cm from a concave mirror of focal length 15 . What is nature and size of image . If the needle is moved closer to the mirror,how would the screen have to be moved
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