a) i) Define the term 'total internal reflection'. (2 marks)
ii) State TWO conditions necessary for total internal reflection to occur. (2 marks)
iii) Give TWO practical applications of total internal reflection. (2 marks)
b) A glass prism of refractive index 1.65 and apex angle 60° is placed in air. A ray of light enters one face of the prism at an angle of incidence of 35°.
i) Calculate the angle of refraction at the first face. (3 marks)
ii) Hence, determine the angle of incidence at the second face of the prism. (2 marks)
iii) Calculate the angle of refraction at the second face (i.e., the emergent angle). (2 marks)
iv) Determine the angle of deviation of the ray through the prism. (2 marks)

Question

a) i) Define the term 'total internal reflection'. (2 marks)
   ii) State TWO conditions necessary for total internal reflection to occur. (2 marks)
   iii) Give TWO practical applications of total internal reflection. (2 marks)
b) A glass prism of refractive index 1.65 and apex angle 60° is placed in air. A ray of light enters one face of the prism at an angle of incidence of 35°.
   i) Calculate the angle of refraction at the first face. (3 marks)
   ii) Hence, determine the angle of incidence at the second face of the prism. (2 marks)
   iii) Calculate the angle of refraction at the second face (i.e., the emergent angle). (2 marks)
   iv) Determine the angle of deviation of the ray through the prism. (2 marks)

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Answer

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