A student investigates the refraction of light through a rectangular transparent block using the pin-tracing method.
During the experiment, the student measures the angle of incidence i=35∘i = 35^\circi=35∘ and the corresponding emerging angle θ=38∘\theta = 38^\circθ=38∘.
State two precautions that the student should take when using pins to ensure that the ray-trace is as accurate as possible.
A second student suggests that iii should be equal to θ\thetaθ within the limits of experimental accuracy (defined here as ±4∘\pm 4^\circ±4∘). State whether the values of i=35∘i = 35^\circi=35∘ and θ=38∘\theta = 38^\circθ=38∘ support this suggestion. Justify your answer.
The student plans to test the hypothesis that i=θi = \thetai=θ for all possible angles of incidence. Describe briefly how they would test this suggestion. State the minimum number of additional values of iii that should be tested.
100 exam-style questions on CIE IGCSE Physics 3.2.2 Refraction of light. Each one has a worked solution and a mark scheme showing where the marks go.