A concave mirror of focal length 20 cm has an object 30 cm away. The mirror moves toward the object at 1 cm/s while the object is fixed. What is the magnitude of object speed relative to the mirror?
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A concave mirror of focal length 20 cm has an object 30 cm away. The mirror moves toward the object at 1 cm/s while the object is fixed. What is the magnitude of object speed relative to the mirror?

G1 Physics · Accepted Answer

Relative speed magnitude is simply 1 cm/s because the object is fixed and the mirror moves at 1 cm/s.