Other questions in this quiz

2. How do you find a focal length?

  • By using a mirror.
  • By measuring the angle of refraction.
  • By focusing a distant object on a piece of paper through the lens. The focal length is the distance between the centre of the lens and the image.
  • By measuring the distance between the focal point and the image.

3. Why does refraction occur?

  • Waves are reflected at boundaries between different materials.
  • Light travels at different speeds in different materials.
  • A lens makes it happen.
  • Waves are refracted at boundaries between different materials.

4. How does a reflecting telescope work?

  • It has an objective lens in which the light is reflected.
  • Using an objective lens and an eyepiece lens.
  • The curved primary mirror focuses light rays from a distant object to an image in the same way as the objective lens in a refracting telescope. This image is then magnified by the eyepiece lens, also just like a refracting telescope.
  • By making light travel through more than one material so that it is refracted.

5. What is the geocentric model?

  • A model by Nicholaus Copernicus
  • The idea that the earth is the center of everything.
  • The idea that planets moved in orbits
  • The idea that the sun is the center of everything.


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