logo

Learning objective

Explain what is meant by the critical angle in the context of light refraction.

Read the explanation, check the common trap, then practise with flashcards and questions.

Practise this topicRead the exam answerTopic hub

Exam focus

  • Read the explanation.
  • Check key terms.
  • Practise with linked questions.
Cambridge IGCSE PhysicsSubject contentCore content

Study support

Understand this objective

Quick explanation

Explain what is meant by the critical angle in the context of light refraction

  • This point belongs to Refraction of light, especially Refraction of light outcomes.
  • You need to be able to explain what is meant by the critical angle in the context of light refraction.
  • The key ideas to know are State and Define.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

StateDefine

Why it matters

This objective helps connect Refraction of light outcomes to exam-style questions, flashcards, and revision notes for Refraction of light.

Revision tools

Choose how to practise

Back to topic hub
Flashcards10 linked cards

Flashcard 1 of 10

Press Space to flip, arrows to move
Practice Questions7 linked questions

Question 1 of 7

Choose an answer, get feedback, then move sideways through the set.

0 of 5 attempted

Paper 3 structured question: Refraction of light

Paper 3Theory (Core)1 marks

Description

Critical Angle Scenario

When light travels from water (n=1.33) to air (n=1.00), it can undergo total internal reflection if the angle of incidence is greater than the critical angle.

  1. a

    State the critical angle for light traveling from water to air.

    Aim for approximately 1 distinct marking point.

    [1]
Revision notestopic notes

Open the full topic revision notes when you are ready to review this objective in context.

Open revision notes

Related learning objectives

Revision hubs

Move back to a broader study route

Cambridge IGCSEPhysics resources