Question

Two non-parallel light rays initially converge to a single point on a screen. A rectangular block of glass is now placed somewhere in front of the screen, in the path of the light rays, so that the glass surface is parallel to the screen. Where is the new convergence point of the rays?

Answer 1

Step-by-step explanation:

The rays will no longer converge on the screen. Instead,, the convergence point will at a distance itself from the glass slab. The rays travel in the same direction as they were before after leaving the glass (because the glass is a slab with parallel faces). However, a bit of the rays would be displaced. It is this displacement which causes the point of convergence to move.