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in a practical class to determine focal length of a convex lens with approximate focal...

in a practical class to determine focal length of a convex lens with approximate focal length as 22cm,a student was finding it difficult to obtain the initial value for the image distance at the back of the lens when the object distance is 15cm.Explain the reason for this?
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Asked by Chukwubuike on 11th November, 2019
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