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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 lens find ? 1)u​

Answer» CT of height 5CM is held 20CM AWAY from converging lens of focal length 10cm,FIND the position, nature and size of the image formedv=20cm, nature = real image, h 2 =5cmGiven, u=-20cmf=10cmv=?We knowf1 = v1 − u1 101 = v1 − 20(−1) v1 = 202−1 v=20cmWe knowmagnification (M)= h o h i = u−v or, −2020 =−1= h o h i since,h 0 =5cmso,h i =−5cmnature = real image


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