Q.  A scree is placed 80 cm from an object . The image of the object on the screen is formed by a convex lens at two different locations, separately by 10 cm . Calculate the focal length of the lens used.

Dear Student ,
Here is a link given below which will help you to solve this question with proper explanation .
https://www.meritnation.com/ask-answer/question/a-screen-is-placed-90cm-from-an-object-the-image-of-the-obj/ray-optics-and-optical-instruments/10701695

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