A point object moves purely perpendicular to the principal axis of a stationary concave mirror. At that instant the transverse magnification is -3 and object speed is 2 cm/s upward. The image velocity is:
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Question

A point object moves purely perpendicular to the principal axis of a stationary concave mirror. At that instant the transverse magnification is -3 and object speed is 2 cm/s upward. The image velocity is:

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G1 Physics · Accepted Answer

For fixed axial distance, transverse image velocity equals m times object transverse velocity: −3×2=−6 cm/s, i.e. 6 cm/s downward.

A point object moves purely perpendicular to the principal axis of a stationary concave mirror. At that instant the transverse magnification is −3 and object speed is 2 cm/s upward. The image velocity is: