What is the term used to describe the point on the principal axis where rays of light parallel to the axis converge (or from which they appear to diverge) after passing through a lens?
Lenses can form either real or virtual images. State one difference between a real image and a virtual image.
A microelectronics engineer uses a high-precision reduction lens to project a circuit pattern from a photomask onto a silicon wafer.
Calculate the actual height of the circuit pattern on the photomask (the object). Use the equation:
magnification=image heightobject height \text{magnification} = \frac{\text{image height}}{\text{object height}} magnification=object heightimage height29 exam-style questions on AQA GCSE Physics 6.2 Electromagnetic waves, covering 6.2.1 Types of electromagnetic waves, 6.2.2 Properties of electromagnetic waves 1, 6.2.3 Properties of electromagnetic waves 2, 6.2.4 Uses and applications of electromagnetic waves, 6.2.5 Lenses, and 6.2.6 Visible light. Each one has a worked solution and a mark scheme showing where the marks go.