Light enters an optical fiber made of glass from air at an angle of incidence of 50∘50^\circ50∘. The angle of refraction in the glass is 30∘30^\circ30∘.
The speed of light in air is 3.0×108 m/s3.0 \times 10^8\text{ m/s}3.0×108 m/s.
Determine the speed of light in the optical fiber.
Describe how optical fibers are used in modern communication systems.
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.