Telescopes. Simple Prism FBends light FSeparates colors.

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Presentation transcript:

Telescopes

Simple Prism FBends light FSeparates colors

Prism  Lens Focal Point Focal Length

Keplerian Refractor Objective Lens Eyepiece Lens

Typical small Refractor

Purpose of a Telescope FGather light PSee fainter objects PProportional to the collecting area FMagnify PGreater detail PM = focal length objective/focal length eyepiece FResolve PSee objects close together

Light Gathering

10.7 cm camera 15.2 cm camera

Resolution

Light Pollution

Problems with the Simple Refractor white Chromatic Aberration Spherical Aberration

Examples of Chromatic Aberration

Example of Spherical Aberration

Hevelius and his long telescope

Achromatic Doublet Positive, crown glass Negative, flint glass

40-inch Yerkes Refractor

Problems of Large Refractors FSupport PCan only support lens by the edge FAbsorption of starlight FImperfections in the glass FGlass flows

Reflectors

Advantages of Reflectors FNo chromatic aberration FNo spherical aberration FMirrors don’t have support problems FNo problems with imperfections in the mirror or absorption in the mirror

Problems of Reflectors FEarly mirrors were metal PTarnished easily PNot very reflective FSome light must be blocked PUsually a second mirror is inserted to divert light

Types of Reflectors Newtonian Prime Focus Cassegrain Coudé

Earl of Rosse’s Leviathan

Mauna Kea

Keck Telescopes – 10 m

Large Binocular Telescope 8.4 m each

Very Large Telescope Four – 8 m

Giant Megellan Telescope 24.5 m

The OWL Telescope (OverWhelming Large) – 100 m

Hubble Space Telescope

James Webb Telescope

The SFA Observatory

Cassegrain Telescopes

10-inch Schmidt- Cassegrain

8-inch Schmidt- Cassegrain

CCD Camera and Color Filters