cse • paper_1 • waves_oscillations
[UPSC CSE 2008] Geometrical Optics (Q157, 20M)
A convex lens of focal length 20 cm and a concave lens of focal length 10 cm are placed 20 cm apart. In between them an object is placed at a distance $ x $ from the convex lens. What is the value of $ x $ in cm so that the images formed by both of them coincide ?
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