A rotating mirror is reflecting a laser light on a screen. What would the speed of the spot illuminated by the laser light be at the instance shown in the picture below, if the angular speed of the rotation of the mirror is ω?
[Diagram showing rotating mirror, laser beam, and screen with distances r and r']
a) ωr′
b) 2ωr′
c) ω(r+r′)
d) ωr
e) 2ωr