Question

If you move toward a plane mirror at a rate 20 cm/s, how fast are you approaching your image?

Answer 1

Answer:

Image distance in the plane mirror is equal to the object distance from the mirror.

let the object distance from the mirror be X cm. So image distance from the object will be 2x  

 

mirror approaching speed = X/t= 10 cm/s

image approaching speed = 2 x X/t = 2x10 = 20 cm/s

Answer 2

Answer:

40 cm/s

Explanation:

relative velocity of object = velocity of object + velocity of image.

relative velocity of object = 20 + 20 = 40cm/s