Question

An insect is moving with 2cm per sec towards plane mirror. With what speed image of insect is approaching towards it.

Answer 1

the image will move with 4cm per sec towards plane mirror. As in one sec object will move 2 cm towards the mirror and the image will also move 2cm towards the mirror. Thus in one sec the distance between object and the image is been decreased by 4cm.
Hence the speed of image with respect to object will be 4 cm per sec.

hope it helped.....!

Answer 2

Answer:

Image of insect will approach at 4 cm/s.

Explanation:

Relative speed

Relative speed is the speed with which the one observer observes the second. It is with respect to first. Speed of one object can be different for different observers. For example, if you are travelling in a train and see the objects outside they are in motion. But if the same objects are seen by observer outside then they are at rest. So, speed is relative. This concept is used here.

Here, an insect is approaching towards the image. The speed of image of insect is same as that of insect with respect to the observer at rest. But with respect to moving insect, the speed of image of insect is given by 2 cm/s + 2 cm/s = 4 cm/s.

So, image of insect appears to approach at 4 cm/s.