An object and a concave mirror of focal length \( f=10 \) \( \mathrm{cm} \) both move along the ...

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An object and a concave mirror of focal length \( f=10 \) \( \mathrm{cm} \) both move along the principal axis of the mirror with constant speeds. The object moves with speed \( V_{0}=15 \mathrm{~cm} \) \( s^{-1} \) 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 \( u=30 \mathrm{~cm} \), the speed of the mirror \( V_{m} \) 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 \( V_{m} \) is \( \mathrm{cms}^{-1} \).
\( (2022) \)
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