The mass of a visual binary pair of stars can be obtained from ...

[rayancarla1]

The mass of a visual binary pair of stars can be obtained from
 
  a. the time in years for them to orbit one another.
  b. the size of their orbit.
  c. their apparent magnitudes.
  d. both the time in years for them to orbit one another and the size of their orbit.

Question 2

A larger-primary lens shows ____________ a smaller-primary lens.
 
  a. more detail than
  b. less detail than
  c. the same amount of detail as

[allisonblackmore]

Answer to Question 1

d

Answer to Question 2

a

[rayancarla1]

Thanks for the timely response, appreciate it

[softEldritch]

Gracias!