Moving point source and converging lens · CAP 2006 #Problem 3
Physics · optics
Problem
A point source of light is moving uniformly along a straight line, which intersects the optical axis of a converging lens under a small angle α at a distance 2F from the lens with a focal distance F. The speed of the source of light is v₀.
i. Draw the lens, the trajectory of the source of light, and the trajectory of its image produced by the lens.
ii. Draw the vector diagram for the velocity of the source of light, the velocity of the image, and the relative velocity of the image with respect to the source.
iii. Determine the minimum relative speed of the image of the source of light with respect to the source.