Scale diagrams for convex lenses (including magnification)

12 questions

1. A lens that bends light rays towards each other so that they meet or cross is called a ___ lens.
2. A student wants to use a lens to create an image on a screen. At which position should the student place the screen to see a sharp image?
3. A student uses a lens to create an image of a car. The real car is 400 cm long. The image of the car is 8 cm long. What is the magnification of the image?
4. Which of these words can be used to describe images made on screens by lenses?
5. The diagrams show parallel light rays being brought to a focus by three different lenses, labelled P, Q and R. Lenses P and Q have the same curvature. Which of these statements must be true?
6. A student uses a lens to make a sharp (clear) image of an object on a screen. Which of these statements must be correct?
7. Which of these statements are correct about rays of light that hit a lens?
8. This scale ray diagram shows an object (an arrow), a convex lens and an image. Which of these words describe the image?
9. This scale ray diagram shows the creation of an image by a convex lens. What is the magnification?
10. The diagram shows rays of light from an object entering an eye through its lens. The rays are focused onto the back of the eye which acts as a screen. How does the eye focus on a more distant object?
11. In this ray diagram, the principal focus on each side of the convex lens is shown as a cross. Three rays from the top of the object (an arrow) are shown. Match each ray with its description.
12. A student tries to use a convex lens to make an image of a bright object. He varies the distance between the screen and lens but finds no image. Which of the following are possible explanations?

License: OGL