Focal length of a convex lens is 20 cm.a pin of hight 2 cm is kept at a distance 10 cm from convex lens. Find the hight of image of pin
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cm.a pin of hight 2 cm is kept at a distance 10 cm from convex lens. Find the hight of image of pin
4h2 = 2h2 balance the eequation20cm
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