A ray of light travels through a glass ornament towards the boundary of an air-filled cavity. At the point where it meets the boundary, the ray makes an angle of 47∘ 47^\circ\,47∘ with the surface. The critical angle for the glass–air boundary is 42∘42^\circ42∘.
Explain whether any of the light passes from the glass into the air cavity.
Calculate the angle between the incident ray and the reflected ray.
93 exam-style questions on Edexcel GCSE Physics 5.1 Reflection, refraction and lenses, covering 5.1.1 Reflection, refraction and total internal reflection, 5.1.2 Specular and diffuse reflection, 5.1.3 Colour of light: absorption and filters, 5.1.4 Lenses: power, focal length and shape, 5.1.5 Ray diagrams for converging and diverging lenses, and 5.1.6 Real and virtual images. Each one has a worked solution and a mark scheme showing where the marks go.