2. A boy stands 10 m in front of a plane mirror . then be moves 3 m towards the mirror. How many metres does his image move towards him? A) 20 B) 14 C) 7 D) 6
1 Answer
D.6
Explanation:
The image formed in a plane mirror is as far behind the mirror as the object is in front of it, i.e. the distance between the object and the mirror
So,here,given
If the boy moves
So,
Now,distance between the boy and his image is
So,the image moved to him by
Alternatively,
From the above discussion,clearly,
So,
Or,
It means velocity of image should be twice than that of man's velocity,so if the man moves by