Which statement is correct when a ray of light passes from air into a transparent medium of refractive index nnn?
The wavelength of the light in the medium is equal to its wavelength in air multiplied by nnn.
The speed of light in the medium is equal to the speed of light in a vacuum divided by nnn.
The angle of refraction is always greater than the angle of incidence.
The frequency of the light decreases when it enters the medium.
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.