Light and sound

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Question 53

State two uses of total internal reflection.

[2]

Describe the conditions required for total internal reflection to occur.

[2]

A light ray travels inside a semicircular plastic block and is incident on the flat boundary with air at point $A$ , as shown in the diagram.

A diagram showing a semicircular plastic block. A light ray traveling inside the plastic is incident on the center of the flat boundary, labeled point A. The angle between the incident ray and the normal line at point A is 32 degrees.

The angle of incidence at $A\,$ is $32∘32^\circ$ . The critical angle of the plastic block is $43∘43^\circ$ . Describe the path of the light ray after it reaches point $A$ .

[2]

State the equation linking critical angle ( $c$ ) and refractive index ( $n$ ).

[1]

Calculate the refractive index of this plastic block. Give your answer to 3 significant figures.

[2]

Light and sound Questions

IGCSE
Physics
Light and sound

IGCSE
Physics Edexcel
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