ReasoningModerate1 mark
4(i)
A ray of light enters a glass block from air and comes out from the opposite surface. If the angle of refraction at the first surface is not the same as the angle of incidence at the second surface, then:
How did you reach the conclusion in (b) above?
Topic: Geometry of refraction through surfaces
Question wording verified against source paper
Answer
Exam answer
For parallel opposite surfaces, their normals are parallel, so the angle of refraction at the first surface must equal the angle of incidence at the second surface. Since they are unequal, the surfaces are not parallel.
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