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Telescopes. Simple Prism FBends light FSeparates colors.

Date post: 13-Jan-2016
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Page 1: Telescopes. Simple Prism FBends light FSeparates colors.

Telescopes

Page 2: Telescopes. Simple Prism FBends light FSeparates colors.

Simple Prism

Bends lightSeparates colors

Page 3: Telescopes. Simple Prism FBends light FSeparates colors.

Prism Lens

Focal Point

Focal Length

Page 4: Telescopes. Simple Prism FBends light FSeparates colors.

Keplerian Refractor

ObjectiveLens

EyepieceLens

Page 5: Telescopes. Simple Prism FBends light FSeparates colors.

Typical small Refractor

Page 6: Telescopes. Simple Prism FBends light FSeparates colors.

Purpose of a Telescope

Gather lightSee fainter objectsProportional to the collecting area

MagnifyGreater detailM = focal length objective/focal length

eyepiece

ResolveSee objects close together

Page 7: Telescopes. Simple Prism FBends light FSeparates colors.

Light Gathering

Page 8: Telescopes. Simple Prism FBends light FSeparates colors.

Light Gathering

10.7 cm camera

15.2 cm camera

Page 9: Telescopes. Simple Prism FBends light FSeparates colors.

Resolution

Page 10: Telescopes. Simple Prism FBends light FSeparates colors.

Light Pollution

Page 11: Telescopes. Simple Prism FBends light FSeparates colors.

Problems with the Simple Refractor

white

Chromatic Aberration

Spherical Aberratio

n

Page 12: Telescopes. Simple Prism FBends light FSeparates colors.

Examples of Chromatic Aberration

Page 13: Telescopes. Simple Prism FBends light FSeparates colors.

Example of Spherical Aberration

Page 14: Telescopes. Simple Prism FBends light FSeparates colors.

Hevelius and his long telescope

Page 15: Telescopes. Simple Prism FBends light FSeparates colors.

Achromatic Doublet

Positive, crown glass

Negative, flint glass

Page 16: Telescopes. Simple Prism FBends light FSeparates colors.

40-inch Yerkes Refractor

Page 17: Telescopes. Simple Prism FBends light FSeparates colors.

Problems of Large Refractors

SupportCan only support lens by the edge

Absorption of starlightImperfections in the glass

Glass flows

Page 18: Telescopes. Simple Prism FBends light FSeparates colors.

Reflectors

Page 19: Telescopes. Simple Prism FBends light FSeparates colors.

Advantages of Reflectors

No chromatic aberrationNo spherical aberrationMirrors don’t have support

problemsNo problems with imperfections in

the mirror or absorption in the mirror

Page 20: Telescopes. Simple Prism FBends light FSeparates colors.

Problems of Reflectors

Early mirrors were metalTarnished easilyNot very reflective

Some light must be blockedUsually a second mirror is inserted to

divert light

Page 21: Telescopes. Simple Prism FBends light FSeparates colors.

Types of Reflectors

Newtonian Prime Focus

Cassegrain

Coudé

Page 22: Telescopes. Simple Prism FBends light FSeparates colors.

Earl of Rosse’s Leviathan

Page 23: Telescopes. Simple Prism FBends light FSeparates colors.

Mauna Kea

Page 24: Telescopes. Simple Prism FBends light FSeparates colors.

Keck Telescopes – 10 m

Page 25: Telescopes. Simple Prism FBends light FSeparates colors.

Large Binocular Telescope8.4 m each

Page 26: Telescopes. Simple Prism FBends light FSeparates colors.

Very Large TelescopeFour – 8 m

Page 27: Telescopes. Simple Prism FBends light FSeparates colors.

Giant Megellan Telescope24.5 m

Page 28: Telescopes. Simple Prism FBends light FSeparates colors.

The OWL Telescope(OverWhelming Large) – 100

m

Page 29: Telescopes. Simple Prism FBends light FSeparates colors.
Page 30: Telescopes. Simple Prism FBends light FSeparates colors.

Hubble Space Telescope

Page 31: Telescopes. Simple Prism FBends light FSeparates colors.

James Webb Telescope

Page 32: Telescopes. Simple Prism FBends light FSeparates colors.

The SFA Observatory

Page 33: Telescopes. Simple Prism FBends light FSeparates colors.

Cassegrain Telescopes

Page 34: Telescopes. Simple Prism FBends light FSeparates colors.

10-inch Schmidt-Cassegrain

Page 35: Telescopes. Simple Prism FBends light FSeparates colors.

8-inch Schmidt-Cassegrain

Page 36: Telescopes. Simple Prism FBends light FSeparates colors.

CCD Camera and Color Filters


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