An astronomical telescope has an objective lens with focal length fo and has an eyepiece with focal length fe. A second telescope has objective and eyepiece lenses with half the focal length of the first telescope. Which telescope gives the greater magnification and by what factor?
a. The second telescope gives 4 times the magnification of the first.
b. The first telescope gives 4 times the magnification of the second. c. The actual focal lengths must be known to answer this question.
d. Both telescopes give the same magnification.
Question 2
The Palomar reflecting telescope has a parabolic mirror with an 80-m focal length. What is the magnification achieved when an eyepiece of focal length 5.0 cm is used?
a. 1200
c. 3200
b. 800
d. 1600
The same star field photographed with (a) a ground-based telescope, which is subject to poor seeing
Radio Telescope
Measuring an infant’s length
Galileo Telescope.
A microwave telescope “sees” microwave light coming from all directions in the sky…
The focal lengths of the objective and the eyepiece in a microscope are 0.29 cm