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we will measure all distance with respect to the position of convex lens.
So, object distance, u = Position of convex lens - Position of candle flame = 50-12 = 38 cm
Since, object is always left to the lens, hence it is taken negative, i.e., u = -38 cm
Similarly, image distance, v = position of the screen - position of the convex lens = 88 - 50 = 38 cm
Hope this information will clear your doubts about the topic.
So, object distance, u = Position of convex lens - Position of candle flame = 50-12 = 38 cm
Since, object is always left to the lens, hence it is taken negative, i.e., u = -38 cm
Similarly, image distance, v = position of the screen - position of the convex lens = 88 - 50 = 38 cm
Hope this information will clear your doubts about the topic.
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