An optical fibre is used to transmit signals using light.
State the name of the process that allows light to travel along the inside of an optical fibre without escaping through the sides.
State the two conditions necessary for this process to occur.
The core of a certain glass optical fibre has a refractive index of 1.52.
Calculate the critical angle at the boundary between this glass and air.
State two common uses of optical fibres.
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.