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Edexcel new P1

Visible light and the solar system 1.1. to 1.4

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