Date post: | 03-Jan-2016 |
Category: |
Documents |
Upload: | elijah-stewart |
View: | 218 times |
Download: | 0 times |
Optical Telescopes
Telescopes that detect light waves from stars.
This type of telescope uses lenses to bend and focus the light from stars.
It was developed by Galileo.
Refracting Telescopes
The refractor telescope uses a lens to gather and focus light more efficiently than the human eye
Refracting Telescopes
Refraction--how lenses and prisms work light slows down when it goes through matter why your arm looks bent in a swimming pool
A curved piece of glass forms a lens focus of lens is where rays of light meet refracting telescopes need at least two lenses,
objective and eyepiece spacing between lenses has to be just right (why you
need a focus adjustment)
Refracting telescope
Focal point – all of the light is focused onto this point inside the telescope.
Eye Piece Objective lens
Reflecting Telescope
This type of telescope uses mirrors to bend light. It was invented by Sir Isaac Newton.
Reflecting Telescopes Light passes through
the tube and hits a concave mirror
The curve in the mirror bends the light so that it bounces onto the flat mirror
Flat mirror bounces the light so that it meets at the focal point (eye piece)