Telescopes Flashcards
1
Q
What is a converging lens
A
It is convex in shape and uses refraction to bring light to a focus
2
Q
What is the focal length
A
The focal length is the distance from the lens to the focus when viewing a distant object
3
Q
When looking at a distant image what does a convex lens form
A
A real image
4
Q
What is a virtual image
A
It is an image we think we can see light rays coming from, but it is not really there
5
Q
What does a reflecting telescope use
A
Mirrors
6
Q
What type of telescope uses lens
A
A refracting telescope
7
Q
What is refraction
A
A process by which a wave changes speed and sometimes direction when it enters a more dense medium e.g air to water
