Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Waves
356 practice questions
Topics covered
Practice questions
181–181 of 181 · Normal
Question 181
5 marks · Normal
Answer and see the solution →A ray of light enters a rectangular block of glass from the air at an angle of incidence of 45°. The refractive index of the glass is 1.5.
(a)[2 marks]Calculate the angle of refraction (to 2 decimal places).
(b)[3 marks]If the critical angle for this glass is 42°, explain what will happen to a ray inside the glass that strikes the glass–air boundary at 40°, then at 45°.