An engineer tests lenses for an inspection instrument. Lenses M and N are made from the same transparent material. Lens M is a diverging lens and lens N is a converging lens.
| Lens | Power |
|---|---|
| M | −4.0 D-4.0\ \text{D}−4.0 D |
| N | +2.0 D+2.0\ \text{D}+2.0 D |
Prototype T is a converging lens made from the same transparent material and has the same diameter as lens N. Its surfaces are less strongly curved than those of lens N.
Identify which lens, M or N, bends light more strongly. Give a reason for your answer.
Predict whether prototype T has a greater or smaller power than lens N. Give a reason for your answer.
Parallel rays pass through a diverging lens and a converging lens. Describe how the paths of the rays after passing through each lens differ.
State where the principal focus of a diverging lens appears to be.
93 exam-style questions on Edexcel GCSE Physics 5.1 Reflection, refraction and lenses, covering 5.1.1 Reflection, refraction and total internal reflection, 5.1.2 Specular and diffuse reflection, 5.1.3 Colour of light: absorption and filters, 5.1.4 Lenses: power, focal length and shape, 5.1.5 Ray diagrams for converging and diverging lenses, and 5.1.6 Real and virtual images. Each one has a worked solution and a mark scheme showing where the marks go.