Describe how a ray of light is able to travel along a curved optical fibre without escaping through the sides. State the name of the phenomenon and the condition required for the angle of incidence.
State one application of optical fibres in medicine and explain how they are used in this application.
Select the most appropriate speed from the list below for each of the following three waves:
Possible Speeds:
The refractive index of diamond is 2.4. Use the speed of electromagnetic waves in a vacuum from (b) to calculate the speed of light in diamond.
216 exam-style questions on CIE IGCSE Physics 3.2 Light, covering 3.2.1a Reflection of light, 3.2.1b Images in a plane mirror, 3.2.2 Refraction of light, 3.2.2a Refraction of light, 3.2.2b Total internal reflection, 3.2.2c Refractive index and critical angle, 3.2.2d Optical fibres, 3.2.3a Converging and diverging lenses, 3.2.3b Ray diagrams and the nature of images, 3.2.3c Virtual images and the magnifying glass, 3.2.3d Correcting long-sightedness and short-sightedness, and 3.2.4 Dispersion of light. Each one has a worked solution and a mark scheme showing where the marks go.