how to find speed of an image if both object and plane mirror are moving
Answers
Explanation:
Image velocity wrt object will be 2u (assuming u is perpendicular to plane of mirror)
Imagine you are standing in front of a mirror and move x units away from the mirror, so you can see that your image also moves away from the mirror by x units i.e 2x units away from you. Since both move in equal time duration, same can be said for velocities.
For a plane mirror, image velocity and object velocity wrt mirror (perpendicular to the plane of mirror) will always be equal in magnitude and opposite in direction.
So image will move with velocity 2u wrt object which is at rest.
NOTE: If mirror has velocity u in the plane of mirror the answer will be zero since the image always stays at equal distance from the object.
Answer:
Image velocity wrt object will be 2u (assuming u is perpendicular to plane of mirror)
Imagine you are standing in front of a mirror and move x units away from the mirror, so you can see that your image also moves away from the mirror by x units i.e 2x units away from you. Since both move in equal time duration, same can be said for velocities.
For a plane mirror, image velocity and object velocity wrt mirror (perpendicular to the plane of mirror) will always be equal in magnitude and opposite in direction.
So image will move with velocity 2u wrt object which is at rest.
NOTE: If mirror has velocity u in the plane of mirror the answer will be zero since the image always stays at equal distance from the object.