Question

If an object moves 5 m/sec towards the mirror and the mirror also moves with speed 5 m/sec towards the object, then the velocity by which image will move towards the mirror is

• A. 15 m/sec
• B. 25 m/sec
• C. 5 m/sec
• D. 10 m/sec

Answer 1

The correct option is A 15 m/sec

Given,
Velocity of an object = 5 m/sec

• When th object is moved with speed V towrds (or away) from the plane mirror then the image also move towards wih speed V.
• If the mirror move with velocity V towards the object then the image moves with velocity of 2V towards the object.
• Therefore total image speed = 2 x velocity of mirror + velocity of object = 2 x 5 + 5 = 15 m/s
• Hence answer is Option D.