A coin collector uses a lens to make the date on a coin appear upright and larger. The focal length of the lens is 8.0 cm.
Name the type of lens used by the collector.
The collector tries holding the coin 5.0 cm from the lens and then 12 cm from the lens. State which of these distances gives an upright, larger view of the date.
The coin is held at the distance that gives an upright, larger view of the date. The collector places a white card on the other side of the lens and moves it slowly towards and away from the lens. No sharp image of the date forms on the card in any position.
State whether the collector sees a real image or a virtual image of the date.
The collector's lens is lens P. Lens Q is the same type of lens, is made of the same material and has the same diameter as lens P. The focal length of lens Q is 4.0 cm.
State which lens, P or Q, has more strongly curved surfaces.
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.