Astronomy ch6

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