1. Compare the light-gathering power of the Palomar Observatory’s 5-m telescope to that of the fully darkadapted human eye, which has a pupil diameter of about 5 mm. 2. Show by means of a diagram why...

1. Compare the light-gathering power of the Palomar Observatory’s 5-m telescope to that of the fully darkadapted human eye, which has a pupil diameter of about 5 mm.

2. Show by means of a diagram why the image formed by a simple refracting telescope is “upside down.”

3. From the ground, how can astronomers detect gamma-ray sources in space?