4. Complete the following ray diagrams to show the path of light in each case (Critical angle of glass - air is 42°) air air air glass 30° glass 42° glass 60°
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The diagram shows a ray of light travelling from air into a glass block (of refractive index 1.42). a. Copy the diagram and label the angle of incidence, the angle of refraction and the normal. b. Calculate the angle of incidence in the glass when the angle of refraction is 29 degrees. c. Calculate the speed of light in the glass. d. State the two conditions for total internal reflection and draw a diagram to illustrate your answer.
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