Edexcel IGCSE Physics · Spec 3.17
Refraction in Rectangular Blocks, Prisms and Semicircles
Covers trace rays through three glass shapes, Measure angles from the normal and Explain why semicircular blocks are useful.
Physics revision video
Refraction in Rectangular Blocks, Prisms and Semicircles
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Spec 3.17
What you need to know
- Trace rays through three glass shapes
- Measure angles from the normal
- Explain why semicircular blocks are useful
Active recall
Quick check
Answer each question before opening the answer.
From which line are angles measured?
The normal
Why is the prism ray deviated overall?
The prism faces are not parallel
Why does a radial ray not bend at the curved face?
It meets the surface normally, at zero incidence angle
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