Parameters for telescopes Flashcards Preview

Astrophysics and cosmology > Parameters for telescopes > Flashcards

Flashcards in Parameters for telescopes Deck (5):
1

Image scale

An object with an angular size theta has an image on the focal plane of size s P = θ/s = 1/f

2

Collecting area

Area of main mirror or lens A = (πd^2)/4

3

Focal ratio

Defined as the ratio of the focal length f to the diameter d

4

Differences in focal ratio

Smaller means brighter but less detail
Larger means duller but more detail

5

Resolution

Ability to distinguish two sources of light very close together