Question

If a source moves from point A to B, does the size and shape of the shadow change?

Answer 1

When the object is at point A, the light source will project a rectangular shadow on the screen.
When the object is brought at B, it is near the cylinder, but as the angle of the light source is not changed, shape of the object will be still a rectangle, but as more light rays will get blocked, the shadow will be bigger in size.