An object and a screen are fixed apart on an optical bench

PHYSICS · Single correct · CBSE · Physics · Ray Optics and Optical Instruments · Ray Optics and Optical Instruments

Problem

An object and a screen are fixed 90 cm90\,\text{cm} apart on an optical bench. A thin convex lens of focal length 15 cm15\,\text{cm} is moved between them and a sharp image is obtained on the screen at two different positions of the lens. What is the distance between these two positions? (a) 45 cm45\,\text{cm} (b) 52 cm52\,\text{cm} (c) 30 cm30\,\text{cm} (d) 60 cm60\,\text{cm}

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