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Cambridge IGCSE Physics practice

What condition must be met for total internal reflection to occur?

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At a glance

MCQ

Type

cambridge_mcq

Style

Topic

Refraction of light

Exam-style question

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What condition must be met for total internal reflection to occur?.

  1. A.The angle of incidence is less than the critical angle.
  2. B.The angle of incidence is equal to the critical angle.
  3. C.The angle of incidence is greater than the critical angle.
  4. D.The light must travel from a less dense to a denser medium.

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Paper 6 structured question: Refraction of light

Paper 6Alternative to PracticalPractical3 marks

Method

Determining the Critical Angle

A light ray is directed at the boundary between water and air at various angles. The angle at which the light no longer refracts into the air is recorded as the critical angle.

Angle of Incidence (degrees)Angle of Refraction (degrees)
00
3020
4530
6045
7060
7570
8090
  1. a

    Describe the method used to determine the critical angle from the results provided.

    Aim for approximately 3 distinct marking points.

    [3]