Car B overtakes another car A at a relative speed of 40 m s - 1 . How fast will the image of car B appear to move in the mirror of focal length 10 cm fitted in car A , when the car B is 1 . 9 m away f

Question

Car B overtakes another car A at a relative speed of 40 m s - 1 . How fast will the image of car B appear to move in the mirror of focal length 10 cm fitted in car A , when the car B is 1 . 9 m away from the car A ?

TestHub · Accepted Answer

Object distance, u = − 1.9 m = 190 cm Focal length, f = 10 cm Magnification, m = f f − u = 10 10 − ( − 190 ) Therefore, m = 10 200 = 1 20 Image velocity, V I = − m 2 V 0 = − 1 20 2 × 40 Hence, V I = − 0.1 m s - 1 Magnitude of velocity = 0 . 1 m s - 1

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