Contents
Independent final check
Explain without the key
explain / state
Final check
(a) Explain why white light is spread into colours by a glass prism, and name the process. (b) Identify the colour of the visible spectrum with the longest wavelength and the colour with the highest frequency. (c) Identify the region of the electromagnetic spectrum just beyond each end of the visible spectrum, and state which of the seven main regions has the lowest frequency. (d) Supplement. A beam of light passes through a prism and is bent, but it is not spread out at all: the card shows one sharp spot. Identify this kind of light and state what is special about it.
explain: give reasons and connect them to evidence. state: give a concise answer.
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Scope and sources
Cambridge IGCSE Physics 0625 · 2026–2028 v2 · Original learning materials.
The dispersion of white light by a glass prism (3.2.4.1); the seven colours of the visible spectrum in order of frequency and of wavelength (3.2.4.2); Supplement: monochromatic light, of a single frequency (3.2.4.3); the main regions of the electromagnetic spectrum in order of frequency and of wavelength (3.3.1); all electromagnetic waves travelling at the same high speed in a vacuum (3.3.2); typical uses of each region (3.3.3) and the harmful effects of too much of some of them (3.3.4); Supplement: the speed of electromagnetic waves, 3.0 × 10⁸ m/s in a vacuum and approximately the same in air (3.3.6). Communication with electromagnetic waves (3.3.5 and 3.3.7–3.3.10) is in its own module; v = fλ is in Waves in a ripple tank; the wavelength of each region, the photon and how the eye sees colour are not covered here.
Apparatus, amounts and times in the experiment are illustrative. Real practical work follows a teacher-approved safety method.
Official Cambridge syllabus