There is one and only one correct answer to each question. Some of the numbers are approximate so pick the nearest correct value. Answers must be on a Scantron sheet. Be sure to put your name , ID number, letter designation of the form, and section on the sheet.
Correct answers appear in red.
The distance of Mars from the earth changes by about a factor of 3. It is easier to support a mirror than a lens. They do not have color aberration. The optics can be folded and so more compact. The star Rigel is very blue and its neighbor Betelgeuse is very red.