CAIE IGCSE Physics 3.2.2 Refraction of Light Topic Practice

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Question 1

[Maximum number: 1]

A ray of light passes from air into glass.

Figure for Question 1 — CAIE IGCSE Physics

What are the angles of incidence and refraction of the ray?

angle of incidence /∘/^{\circ}

angle of refraction /∘/^{\circ}

40

25

40

65

50

25

50

65

Question 2

[Maximum number: 1]

The diagram shows a narrow beam of light incident on a glass-air boundary. Some of the light emerges along the surface of the glass and some is reflected back into the glass.

Figure for Question 2 — CAIE IGCSE Physics

Which row is correct?

this is an example of
total internal reflection

angle θ\theta is the
critical angle

no

yes

no

no

yes

no

yes

yes

Question 3

[Maximum number: 1]

A ray of light enters a transparent plastic wedge from air and is incident on the lower surface at the critical angle, as shown.

Figure for Question 3 — CAIE IGCSE Physics

The angle of incidence is i, the angle of refraction is r, and the critical angle is c.
In which ray diagram are the angles labelled correctly?

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