Question

his surprise, he found that one of the physical quantities was changing when, he measured it at two far off places on earth. He thought it was a problem with the device he measured. Once again he rechecked it but it was the same and confirmed that one of the physical quantities was changing.
i) What do you think, was the quantity, which was changing?
ii) Name the device used to measure the other physical quantity which remains constant at both the places.
1. mass and physical balance
2. mass and spring balance
3. weight and physical balance
4. weight and spring balance​

Answer 1

Answer:

When the man is 2m infront of the mirror ,the image is 2m behind the mirror.

After mirror is moved 1m towards the man and the man moves 50m away from mirror,the effective distance between man and mirror is 51m.

Therefore image formed will be 51m behind the mirror.

Hence the distance between image and object is 102m.