Q.13. 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 mew mirror the image of a truck parked behind his car. The speed at which the image of the truck appears to approach the driver will be (i) 1 m/s (ii) 2 m/s (iii) 4 m/s {iv) 8 m/s
Explanation: If an object approaches the mirror image with speed v then image approaches the object with 2v. The driver is approaching the image with 2m/s then the will approach the driver with 2 × 2m/s i.e. 4m/s. Hence 4m/s is the answer.
