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Edexcel new P1
Visible light and the solar system 1.1. to 1.4
| Question | Answer |
|---|---|
| orbit | The path taken by planet around the Sun or a satellite about a planet |
| heliocentric | model of the solar system with the sun at the centre |
| geocentric | model of the solar system with the earth at the centre |
| telescope | A device that produces magnified images of distant objects |
| visible light | Electromagnetic radiation that can be detected by the human eye |
| solar system | An area of space in which objects are influenced by the Sun's gravity |
| Milky Way | The name of our galaxy |
| Galaxy | A group of millions of stars held together by gravity |
| focal length | The distance from the lens to the focal point |
| focal point | The point where parallel rays of light converge (meet)after passing through a lens also where the image of a very distant object is produced |
| eyepiece lens | The lens closest to the observer's eye. Its job is to magnify the image formed by the objective lens ( refraction telescope) or mirror ( reflection telescope ). |
| objective lens | The lens nearest the object being observed. |
| refraction | A change in speed and direction when waves move from one material to another |
| converging lens | A lens that brings rays of light together. Thick in middle, thin at edges |
| virtual image | An image that cannot be projected on to the screen. The eyepiece lens produces an upright, magnified virtual image like a lens being used as a magnifying glass |
| real image | An image that can be projected onto a screen |
| refracting telescope | A telescope made of a series of lenses |
| reflecting telescope | A telescope where the main focusing is done by a curved mirror. |
Created by:
Susan E Casey
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