Pearson Edexcel International GCSE (9–1) · PHYSICS · Section
Light Waves
16 practice questions
Practice questions
11–16 of 16
Question 11
4 marks · Normal
Answer and see the solution →A student shines a ray of light at a glass block at an angle of 30° to the normal. The glass has a refractive index of 1.52.
(a)[1 mark]State Snell's law (the law of refraction) in words.
(b)[3 marks]Calculate the angle of refraction in the glass. Give your answer to 2 decimal places. ( refractive~index = \frac{sin~i}{sin~r} )
Question 12
4 marks · Normal
Answer and see the solution →Describe an experiment to determine the refractive index of a glass block using a ray box and a protractor.
(a)[1 mark]List the apparatus you would need.
(b)[2 marks]Outline the steps you would take during the experiment.
(c)[1 mark]State how you would use your results to calculate the refractive index.
Question 13
3 marks · Normal
Answer and see the solution →The diagram shows a light ray travelling from air into glass at an angle of incidence of 0°.
Ray entering glass at 0° to the normal (diagram not to scale) Explain, using physics ideas, why the ray does not change direction as it enters the glass.
(a)[3 marks]Question 14
1 mark · Normal
Answer and see the solution →Which statement is correct about the angle of incidence and angle of reflection for a plane mirror?
- A.The angle of incidence is always larger than the angle of reflection.
- B.The angle of incidence is always smaller than the angle of reflection.
- C.The angle of incidence equals the angle of reflection.
- D.The angle of incidence is always 90°.
Question 15
2 marks · Normal
Answer and see the solution →Calculate the refractive index of a material if a ray of light enters it from air (angle of incidence 50°) and the angle of refraction is found to be 28°. ( refractive~index = \frac{sin~i}{sin~r} )
Question 16
2 marks · Normal
Answer and see the solution →Describe one difference between a luminous object and a non-luminous object. Give an example of each.