Part 1 What is the biggest advantage of a reflecting telescope? The focal length

ID: 3279235 • Letter: P

Question

Part 1

What is the biggest advantage of a reflecting telescope?

The focal length is longer.

all of these

The eyepiece is smaller.

The light never passes through glass before the eyepiece.

Part 2

Which of the following is a reason that reflecting telescopes have shorter tubes than refracting telescopes?

The light goes up the tube and then back down.

all of these

The light reflects from the edge of the mirror.

Mirrors always have shorter focal lengths than lenses.

Part 3

Why are short tubes an advantage for large telescopes?

Short tubes weigh less than those of refracting telescopes.

all of these

Short tubes can be supported with less vibration.

Short tubes can fit inside a smaller observatory building.

Part1) Fourth option is correct. The light never pass through any glass before eyepiece. So there is no chromatic aberrations...

Part2) first option is correct. Light goes up and then comes down.

In this case, light goes in the tube and then get reflected and comes back, so less length of tube is needed.

Part3) All of these.

So second option is correct