the principle of optical piece of a reflecting telescope is a
mirror
for a refractor is a
lence
what are 4 problems with refractors
Sagging of heavy lenses, absorption of light, defect free interior and u.v. and lots of visible
how do reflectors solve the problems that refractors have
mirrors
other than using a refractor instead, what are two solutions to spherical aberration which spherecal reflectors suffer
mirror, lense
the biggest telescopes are
reflectors
galileo's telescope was a
refracter
newton's was a
reflector
cassegrain has mirror
2
clude has mirror
3
newtonian has mirror
2
prime
1
what's the magnification for a telescope with a 120-cm focal length objective if you attach a 4-cm focal length eyepiece
120/4=30x
how many times dimmer objects can someone looking through the keck telescop (10-mm diameter) see than with their unaided eye (5 mm pupl diameter)
light gatering p ratio=d_keck/d_eye=10000mm/5mm squared=2000 squared= 4 million
how many time better resolution does the keck telescop have than the eye using the same wavelength of light
d_keck/d_eye=10 m / 5 mm=10000mm/5mm=2000
which is better: 1/2 arc sec seeing disk (mauna kea) or 1 arc sec (cerro tololo)
mauna kea
where's the best location on earth for optical telescopes
monikay
in order to get the best resolution, where in the solar system should a radio telescope be put
jupitor, moon, as far out as you can
why are essentially all u.v. images of the sun published in false color
they would look blank
what are the two "windows" through the atmosphere for E.M. radiation such that telescopes observing those wavelength regions work on the ground
visible light window, radio window
what are 3 important devices that are often connected to research telescopes to improve the data gathering
spectrescop, photomitor and U.D. computer
how is photography superior to the eye
longer exposure time
how are C.C.D.'s superior to photography
greater quantum efficiency