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Question
The rear view mirror of a car is a plane mirror. A driver is reversing his car at a speed of 2 m/s. The driver sees in his rear view mirror the image of truck parked behind his car. The speed at which the image of the truck appears to approach the driver will be ______.
Options
1 m/s
2 m/s
4 m/s
8 m/s
Solution
The rear view mirror of a car is a plane mirror. A driver is reversing his car at a speed of 2 m/s. The driver sees in his rear view mirror the image of truck parked behind his car. The speed at which the image of the truck appears to approach the driver will be 4 m/s.
Explanation:
- In a plane mirror, the relative speed of the image is twice the speed of the object.
- So, if the car is moving at 2 m/s, the image of the truck will appear to approach the driver at 4 m/s.
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