A ray falls on a rectangular glass slab at an angle of incidence of 35°.
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A ray falls on a rectangular glass slab at an angle of incidence of .
- At what angle does it leave the slab?
- How is the leaving ray related to the incoming ray?
- Is the lateral displacement zero?
Need a reminder? The key ideaShow
A ray through a glass slab leaves parallel to the way it came (), shifted sideways by the lateral displacement . Looking straight down into water, : things look shallower.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) The second bend undoes the first, so .
Step 2. (b) The leaving ray is parallel to the incoming ray.
Step 3. (c) No. A slanting ray is shifted sideways. Only a ray along the normal has .
Answer: (a) . (b) Parallel. (c) No.
Check. In a prism the faces are not parallel, so the ray leaves in a new direction.
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