combination has its image coinciding with itself

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Gupta Ravi

A convex lens is placed in contact with a plane mirror. A point object at a distance of 20 cm on the axis of this combination has its image coinciding with itself. What is the focal length of the lens?

The focal length of the given convex lens is 20 cm. Class 12 Physics Chapter 9 Ray Optics and Optical Instruments Session 2024-2025.