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Explorations: Stars, Galaxies, and Planets
Thomas Arny, University of Massachusetts
Telescopes

Essay Questions



1

How, apart from magnification, do binoculars help you see better?
2

Which binoculars should you choose to observe at night: a pair with 50-millimeter lenses or a pair with 35-millimeter lenses? Why?
3

Why does the useful resolving power of a ground-based telescope with a 2-meter diameter mirror not match its theoretical value?
4

If you look with binoculars down a beach on a hot day, you will see that distant objects appear shimmery. How is this related to astronomical "seeing"?
5

Put a pencil straight down into a glass of water. Notice whether the pencil looks bent. Now tilt the pencil and note how its apparent bending changes. How does this illustrate why light from objects near the horizon is refracted more strongly?








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