The Keck Telescope (on Mauna Kea, Hawaii) has an aperture D = 10.0 m. Its Cassegrain focus has f/15. What is the focal length and plate scale?

Under ideal conditions and when Mars is closest, estimate the linear separation between two objects on Mars that can barely be resolved by (a) the naked eye and (b) the Hubble telescope (whose main mirror is 2.4 meters in diameter). (Hint: the answers are about 5000 km and 14 km)

list 4 retracting telescopes

The primary mirror on a telescope has a 43m radius of curvature and the eyepiece has a focal length of 36 mm. Determine the maginification and length of the telescope (for length, treat telescope as a refracting telescope) M = ___ L =______

A telescope is used to resolve two distant stars. By what factor will the resolution of the telescope change if the diameter of the lens is doubled? a)The resolution will increase by a factor of 4 b)The resolution will increase by a factor of 2 c)The resolution will not change, although more light will be collected. d)The resolution will decrease by a factor of 2 e)The resolution will decrease by a factor of 4 f)

What CANOT be explained by ray optics? the resolution of telescope. image reversal in a mirror. camera lens refraction. X the transmission of signals in fiber optic.

Why does primary or objective lens of a refracting telescope should have a longer focal length?