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Optics > Telescopes > Flashcards

Telescopes Flashcards

1
Q

What are telescopes? Types?

A

Optical system consisting of 2 lenses separated in space

Keplerian
Gallillean

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2
Q

What are KePlerian telescopes

A

Weak + objective lens
Strong + eyepiece lens
2 convex lens
Separated by sum of focal lengths

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3
Q

What is the image formed by a Keplerian telescope

A

Inverted - require erecting lens or prisms to make is terrestrial telescope

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4
Q

What are galillean telescopes?

A

Weak + objective lens
Strong - eyepiece lens

1 convex, 1 concave lens
Lenses separated by difference of focal lengths

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5
Q

What is the image formed in galillean telescopes

A

Erect

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6
Q

What are advantages of galllilean telescopes?

A

Image upright
No need fo erecting prism
Device shorter
2,3,4x strngth
Inexpensive
Light
Large exit pupil

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7
Q

Pros cons of Keplerian telescope

A

4x and stronger usually Keplerian

Superior optical image
More expensive
Smaller exit pupil requiring better centring and aiming

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8
Q

Uses of Galillean telescope?

A

Low vision aids
Surgical loupes

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9
Q

uses of Keplerian telescope

A

Compound microscopes
Keratometer
Focimeter

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Optics (2 decks)

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