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Physics (Cambridge)

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Specimen · 5054/02 · 2023 · Q57 marks · sit it in its paper
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CIE-5054-2023-SP-p02 · Question 5

You may use a calculator. You should show all your working and use appropriate units. Take the weight of 1.0 kg to be 9.8 N (acceleration of free fall = 9.8 m/s²).
(a)

Fig. 5.1 shows light in air, incident on the side of a rectangular glass block at an angle of 60°.

The refractive index of the glass is 1.6. The light travels in the glass and is incident on side XY at P.

Underline all the terms that describe a wave of light.

electromagnetic longitudinal radioactive transverse

[1 mark]
(b)

At the point where the light enters the glass, the angle of refraction is r.

Calculate angle r.

r = ......................................................... °

Answer guidance

Calculate Show your working. The method can earn marks even when the final value is wrong, and a bare answer often cannot.

[2 marks]
(c)(i)

Calculate the critical angle c for light travelling in the block.

c = ......................................................... °

Answer guidance

Calculate Show your working. The method can earn marks even when the final value is wrong, and a bare answer often cannot.

[2 marks]
(c)(ii)

At P, the angle θ between the ray and the normal is given by θ = 90° − r.

State and explain what happens to the light when it is incident on side XY.

Answer guidance

State A short answer. No explanation is needed, and adding one cannot earn extra marks.

[2 marks]