The wavelength of green light changes from 5.4 × 10-7 m to 3.6 × 10-7 m as it passes from air to glass. What is the speed of this light in glass? (Take the speed of light in air to be 3.0 × 108 m/s.)
1.2×108 m/s1.2 \times 10^8\text{ m/s}1.2×108 m/s
2.0×108 m/s2.0 \times 10^8\text{ m/s}2.0×108 m/s
2.4×108 m/s2.4 \times 10^8\text{ m/s}2.4×108 m/s
3.0×108 m/s3.0 \times 10^8\text{ m/s}3.0×108 m/s
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.