Today’s lesson Critical angle Total internal reflection Dispersion.

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Presentation transcript:

Today’s lesson Critical angle Total internal reflection Dispersion

i Ask them to set up the experiment as above. Gradually increase the angle of incidence. What happens?

i

Critical Angle?

i

Critical Angle i Critical angle (when angle of refraction is 90º)

Critical Angle 90º The Critical angle is the angle of incidence that produces an angle of refraction of 90º Copy! Critical angle

Total Internal Reflection Bigger than Critical angle

Right-angled prisms Demonstrate (or get them to do it) TIR in a right-angled prism.

Examples of Total Internal Reflection

Examples of Total Internal Reflection

Examples of Total Internal Reflection

Examples of Total Internal Reflection

Examples of Total Internal Reflection

Examples of Total Internal Reflection

Dispersion – Triangular prism

Dispersion – Triangular prism

Read pages 148 to 151 A suitable page(s) of their textbook

Questions! Page 149 Questions 1, 2 and 3. Suitable questions from their textbook

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