1.

an object of hight 5cm is placed near infront of a convex lens of focal length 20cm .and image of hight 20cm is formed behind the mirror find v ?​

Answer»

u= -30 cm f= -20 cm By USING mirror formula, 1/v + 1/u = 1/f 1/v + 1/-30 = 1/-20 v= -60 cm negative sign indicates that image is in front of the mirror THEREFORE, The DISTANCE between image and object = 60–30 = 30CM



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