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Refractor Telescopes

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by

Mrs. Rekman

on 27 January 2014

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Transcript of Refractor Telescopes

Refractor Telescopes
Changing the View of the Universe
Some Special Words
Abberration
Concave lens
Convex lens
Focal Point
Geocentric universe
Focal length
Refractor Discoveries
1673 - Helevius's fractor
1686 - Huygen's refractor
1847 - Harvard refractor
1873 - Naval refractor
Heliocentric universe
How do refractor telescopes work?
There are two lenses the convex and concave.
The convex lens, or primary lens was used to take a large area of light and focus it onto a smaller area.
The concave lens then expands the light again to bring parallel rays to the users' eye.
Challenges
spherical shape of lens
too many focal points - creating fuzzy shapes with a ring of colour around it. (abberration)
PROBLEM #1
SOLUTION
Kepler (1611)
two flatter convex lenses
long focal lengths
extremely long telescopes (some were 35 metres
PROBLEM #2
SOLUTION
Lens Doublet (1729)
a convex and concave lens were used together as primary lenses
Conclusion
How did this telescope change people's view of the universe?
1600s - the earth was seen as the centre of the universe.
Galileo observed unusual behaviours of planets.
He made the discovery that the universe was in fact centered around the sun.
Full transcript