Contents

Motion, forces and energy

Thermal physics

Waves

Electricity and magnetism

Magnets and magnetic fields
Static electricity and electric fieldsBeing prepared
Current and circuit diagramsBeing prepared
Voltage and resistanceBeing prepared
Series and parallel circuitsBeing prepared
Sensors and potential dividersBeing prepared
Electricity at homeBeing prepared
ElectromagnetsBeing prepared
The motor effectBeing prepared
Generators and inductionBeing prepared
Transformers and the gridBeing prepared

Nuclear physics

Inside the nucleusBeing prepared
Ionising radiation and safetyBeing prepared
Radioactive decay and half-lifeBeing prepared

Space physics

Earth, Sun and MoonBeing prepared
The Solar System and orbitsBeing prepared
Stars and their life cycleBeing prepared
The expanding UniverseBeing prepared

Part 2 of 2

Page 02

Virtual images

identify

Try it yourself

The diagram shows a parallel beam of light passing through a diverging lens. Four points, P, Q, R and S, are marked on the principal axis, 10 cm apart. Which point is the principal focus of the lens?

identify: name or select.

A diverging lens, thinner in the middle than at its edges, on a horizontal principal axis. Three orange rays parallel to the axis arrive from the left and spread out after the lens. Four points are marked on the axis, equally spaced 10 cm apart: P on the left, 10 cm in front of the lens; Q at the centre of the lens; R 10 cm to the right of the lens; S 20 cm to the right of the lens.

Choose one answerPQRS

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Cambridge IGCSE Physics 0625 · 2026–2028 v2 · Original learning materials.

The action of thin converging and diverging lenses on a parallel beam of light (3.2.3.1); focal length, principal axis and principal focus (3.2.3.2); ray diagrams for the formation of a real image by a converging lens (3.2.3.3); describing an image as enlarged, same size or diminished, upright or inverted, real or virtual (3.2.3.4); a virtual image formed when diverging rays are extrapolated backwards, which cannot be projected onto a screen (3.2.3.5); Supplement: ray diagrams for a virtual image formed by a converging lens (3.2.3.6), a single lens as a magnifying glass (3.2.3.7), and converging and diverging lenses correcting long-sightedness and short-sightedness (3.2.3.8). The lens equation and lens power are not in the syllabus; ray diagrams for images formed by a diverging lens are not drawn here; the structure of the eye is in Biology; dispersion of light is in Light and the electromagnetic spectrum.

Apparatus, amounts and times in the experiment are illustrative. Real practical work follows a teacher-approved safety method.

Official Cambridge syllabus