When a Knowledgeable Amateur Astronomer Tells You That She Has

Multiple Choice

When a knowledgeable amateur astronomer tells you that she has a 14-inch telescope, what does the number 14 refer to?

A) the number of times the image is magnified (how much bigger it looks)
B) the length of the main telescope tube
C) the focal length
D) the length of the eyepiece tube
E) the diameter of the primary lens or mirror