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Flashcards in Parameters for telescopes Deck (5)
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1
Q

Image scale

A

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

2
Q

Collecting area

A

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

3
Q

Focal ratio

A

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

4
Q

Differences in focal ratio

A

Smaller means brighter but less detail

Larger means duller but more detail

5
Q

Resolution

A

Ability to distinguish two sources of light very close together