Draw and label a simple diagram of the following: a. a refracting ...

[mwit1967]

Draw and label a simple diagram of the following: a. a refracting telescope b. a reflecting telescope
 
  What will be an ideal response?

Question 2

Why are Cepheid variables so important for measuring distances in astronomy?
 
  A) They all have the same luminosity.
  B) They all have the same period.
  C) Their luminosity can be inferred from their period.
  D) They are close enough to have a detectable parallax.
  E) They are circumpolar like Polaris, the North Star.

[Pariscourtney]

Answer to Question 1

Diagrams should look similar to Figures 6.9 and 6.10 in the text.

Answer to Question 2

C

[mwit1967]

Excellent

[shewald78]

Gracias!