5.1 Reflection, refraction and lenses

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Question 8

The critical angle for a glass-air boundary is $43∘43^\circ$ . The table describes four rays at this boundary.

Ray	Direction of travel	Angle of incidence
P	glass to air	$38∘38^\circ$
Q	air to glass	$50∘50^\circ$
R	glass to air	$43∘43^\circ$
S	glass to air	$50∘50^\circ$

Which ray undergoes total internal reflection?

[1]

ray P

ray Q

ray R

ray S

Markscheme

5.1 Reflection, refraction and lenses Questions

GCSE
Physics
5.1 Reflection, refraction and lenses

93 exam-style questions on Edexcel GCSE Physics 5.1 Reflection, refraction and lenses, covering 5.1.1 Reflection, refraction and total internal reflection, 5.1.2 Specular and diffuse reflection, 5.1.3 Colour of light: absorption and filters, 5.1.4 Lenses: power, focal length and shape, 5.1.5 Ray diagrams for converging and diverging lenses, and 5.1.6 Real and virtual images. Each one has a worked solution and a mark scheme showing where the marks go.

Question bank·5.1 Reflection, refraction and lenses