Send the link below via email or IMCopy
Present to your audienceStart remote presentation
- Invited audience members will follow you as you navigate and present
- People invited to a presentation do not need a Prezi account
- This link expires 10 minutes after you close the presentation
- A maximum of 30 users can follow your presentation
- Learn more about this feature in our knowledge base article
Transcript of Refractor Telescopes
Changing the View of the Universe
Some Special Words
1673 - Helevius's fractor
1686 - Huygen's refractor
1847 - Harvard refractor
1873 - Naval refractor
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.
spherical shape of lens
too many focal points - creating fuzzy shapes with a ring of colour around it. (abberration)
two flatter convex lenses
long focal lengths
extremely long telescopes (some were 35 metres
Lens Doublet (1729)
a convex and concave lens were used together as primary lenses
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.