Reflective Refractive Spectro scopy Space Large telescopes How Optical works $ 200 $ 200$200 $ 200 $...

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Transcript of Reflective Refractive Spectro scopy Space Large telescopes How Optical works $ 200 $ 200$200 $ 200 $...

Page 1: Reflective Refractive Spectro scopy Space Large telescopes How Optical works $ 200 $ 200$200 $ 200 $ 200 $400 $ 400$400 $ 400$400 $600 $ 600$600 $
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ReflectiveRefractiv

eSpectroscopy

SpaceLarge

telescopes

How Optical works

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Draw a convex lens

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The lens are made of glass and the larger they are , the more heavy and more flawed

they can be.

Why are refractive telescopes usually smaller than

reflective?

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Reflective

A telescope with a convex mirror and an eyepiece on the

side is a

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They gather more light and have better resolution

Why might you want a larger scope than a smaller one?

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$1000The Cassegrain needs a hole drilled in the

middle of the primary mirror for the eyepiece and its secondary mirror in convex

rather than flat.

Why is a Newtonian reflector easier to build than a Cassegrain?

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Reflection

The process when Photons bounce off a polished surface

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Refraction

The tendency of a wave to bend as it passes from one transparent medium to another is

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Chromatic aberration

Fuzziness in your lens is caused by

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CCD’s are faster at capturing light so shorter exposure time. The image is digital, no wait time to be developed. The image is stored on computers, so can be transmitted

via the Internet

Why is a CCD better than photography for telescopes?

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$1000Reflectors use a concave mirror to reflect

light back to a focus, refractors use a convex lens to bend light to a focus.

Compare how a reflector makes an image versus a

refractor

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radio

The lowest energy EM radiation is

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Most information we receive about the Universe comes in EM waves, especially

light. We can get temperature, compostion and motion from a spectrum

Why do astronomers relie on spectroscopy?

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An emission spectrum of bright lines (Kirchoff’s 2nd law)

A nebula is a low density cloud of hot gas, what is its

spectrum?

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Describe two ways that light is separated out into its component colors for

spectroscopy

Using a prism or diffraction gratings where thin slits diffract light.

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1st Law: dense hot objects create a continuous spectrum

2nd law: low density gas gives off bright emission lines

3rd law: cool thin gas creates dark lines in the spectrum

Describe Kirchoff’s three laws

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Turbulence or star twinkling

Adaptive optics help correct

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NO.

Is it true that the HST is the Largest telescope ever built?

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Infrared and Ultraviolet

Besides visible light, Hubble does work in what two other

wavelengths?

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The Chandra uses which kind wavelength to form images?

X-rays

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Adaptive optics are for poor visibility due to atmospheric blurring, Hubble is in space!

Why doesn’t the Hubble Telescope need adaptive

optics?

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To collect light and bring it to focus

The primary purpose of telescopes is to

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What is the downside of radio telescopes?

Poor resolution due to the large wavelength

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Interferometry

Using multiple telescopes to enhance resolution via

computers is called

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The atmosphere blocks most UV radiation

Why is UV astronomy hard to do from the ground?

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Name three ways that radio telescopes have an advantage

over optical telescopes.

Can be used in daytime and night. Less effected by weather/ Allow us to see

objects at different wavelength than visible light.

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To get above the influences of our atmosphere

Why do we put telescopes in space?

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resolution

The ability to distinguish between two adjacent objects is

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The resolution is 2x’s as sharp and can now detect 4x’s as dim of objects.

How does doubling the diameter effect resolution and

light?

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$800Stars do not twinkle in space but as they pass

through our atmosphere the light is shifted by turbulence.

Why do stars appear to twinkle?

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The object has already flipped over since the eyepiece lies behind the focal point.

Why is the image in a telescope eyepiece inverted?