An optical researcher measures the angle of incidence (θi\theta_iθi) inside a block of a newly developed high-index polymer and the corresponding angle of refraction (θr\theta_rθr) as light exits the polymer into a surrounding air chamber.
They plot their results on the graph below.
Estimate the angle of incidence in the polymer which gives an angle of refraction of 90∘90^{\circ}90∘.
Reflection, refraction and lenses Questions
Practise Edexcel GCSE Physics Reflection, refraction and lenses with exam-style questions for Foundation and Higher tier. 100 questions, matched to the Edexcel GCSE Physics (1PH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.