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GCSE questions on refraction and TIR

Q8. The diagram shows a ray of light travelling through a semicircular glass block. The angle of incidence is labelled 'i'

(a)

(i) The angle of incidence i equals the critical angle for the glass.

Complete the diagram to show what happens to the ray of light at the glass-to-air boundary.

[1 mark]

(ii) The critical angle for the glass is 41°. Calculate the refractive index of the glass.

[2 marks]

(b) The diagram below shows what happens to a ray of light as it meets the boundary between air and water.

The refractive index of the water is 1.3

Calculate the angle of refraction r.

[3 marks]

(Total 6 marks)