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JEE Advanced 2022 Paper 2

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Question : 26

Total: 54

An object and a concave mirror of focal length f=10‌cm both move along the principal axis of the mirror with constant speeds. The object moves with speed V0=15‌cm‌s−1 towards the mirror with respect to a laboratory frame. The distance between the object and the mirror at a given moment is denoted by u. When u=30‌cm, the speed of the mirror Vm is such that the image is instantaneously at rest with respect to the laboratory frame, and the object forms a real image. The magnitude of Vm is cms−1

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