Telescopes and Binoculars

Question 1

Of the two types of telescopes used today, which type is a refracting telescope?

Answer 1

Galilean

Question 2

Of the two types of telescopes used today, which type is a reflecting telescope?

Answer 2

Keplarian

Question 3

What is an advantage of the Galilean telescope?

Answer 3

The image is upright

Question 4

What is an advantage of the Keplerian telescope?

Answer 4

The field of view is larger

Question 5

What is a disadvantage of the Galilean telescope?

Answer 5

The field of view is smaller

Question 6

What is a disadvantage of the Keplerian telescope?

Answer 6

The image is inverted

Question 7

A refracting telescope uses what lenses?

Answer 7

One converging lens and one diverging lens

Question 8

The advantage for telescopes in low vision includes which of the following?
a.) images from a distant object appear to be larger as they come from the telescope
b.) a telescope is the only low vision device that can be used for distant vision
c.) can be mounted in the distant portion of standard distant lenses
d.) all of the above

Answer 8

d.) all of the above

Question 9

The disadvantage for telescopes in low vision includes which of the following?
a.) Reduced field of view
b.) Exaggerated movement of objects viewed
c.) spatial orientation
d.) All of the above

Answer 9

d.) All of the above

Question 10

What do the numbers represent on a telescope that is labeled 7X20, 7.5?

Answer 10

The image is 7X larger than normal, the objective lens is 20mm, and the field of view is 7.5 degrees

Question 11

What would the technical specs of 10/42 mean on a pair of binoculars?

Answer 11

The magnification is 10X and the objective lens is 42mm

Question 12

For a pair of binoculars, which of the following is true?
a.) the lower the magnification, the narrower the field-of-view
b.) the greater the magnification, the narrower the field-of-view
c.) the lower the magnification, the wider the field-of-view
d.) the greater the magnification, the wider the field-of-view
e.) b & c

Answer 12

e.) b & c

Question 13

The larger the aperture on a pair of binoculars, the brighter the image may appear. True or false?

Answer 13

True

Question 14

Binoculars used for sporting events should include the most magnification possible. True or false?

Answer 14

False, because spatial orientation would be more of a problem with more magnification

Question 15

For a pair of binoculars with small apertures, it is generally suggested that one use higher magnification. True or false?

Answer 15

False.