1. What type of waves are electromagnetic waves?
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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.