P1.1 Visible light and the solar system Flashcards
Who came up with the idea of a geocentric model?
Ptolemy
Who came up with the idea of a heliocentric model?
Nicholaus Copernicus
What does geocentric mean?
Earth centred
What does heliocentric mean?
Sun centred
What do luminous objects in space give out?
Visible light
What does visible light travel as?
Waves
What does interface mean?
Boundary
What is refraction?
The change in direction when a light ray moves into a different material
Where does refraction happen?
Between the interface of two materials
What is the normal line?
The line at right angles to the surface of a mirror or lens when a ray of light hits it
What is another name for a converging lens?
A convex lens
What is the focal length of a lens?
This distance between the focus and the lens
How can you find the focal length of a converging lens?
By focusing the image of a distant object onto a piece of paper and measuring the distance between the lens and the paper
What does the eyepiece lens in a refracting telescope do?
Magnify the image created by the objective lens
What does a refractive telescope consist of?
- a tube
- an objective lens
- an eyepiece lens
