13. The rearview 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 rearview 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
We are given that the speed of the car is 2 m/s which implies, the car is approaching the truck with a speed of 2 m/s.
Hence the speed at which the image of the truck appears to approach the driver will be: 22 = 4 m/s.
Hence the correct answer is option (iii).