Question 1

What is used to make a reflecting telescope?

Accepted Answer

Concave mirror

Answer

Concave lens

Answer

Convex mirror

Answer

Convex lens

Question 2

What type of mirror is used for secondary mirror?

Accepted Answer

Convex mirror

Answer

Concave mirror

Answer

Concave kens

Answer

Convex lens

Question 3

Which of following is not a reason for using a secondary mirror

Accepted Answer

Increase the field of view

Answer

Stops viewer getting in the way

Answer

Increase angular magnification

Answer

Increases the focal length

Question 4

What is spherical aberration?

Accepted Answer

Rays of light do not focus at a single point

Answer

White light disperses

Answer

Blue light refracts more than red

Answer

Mirror is too round

Question 5

What type of mirror is used to correct spherical  aberration?

Accepted Answer

Parabolic

Answer

Round

Answer

Oval

Answer

Egg

Question 6

What will an image look like if spherical aberration has occurred?

Accepted Answer

Blurry

Answer

Magnified

Answer

Blurry with Multicoloured edges

Answer

Diminished

Question 7

Increasing the objective lens/mirror from 10mm to 50mm  will increase the amount of light it collects by

Accepted Answer

25 times

Answer

125 times

Answer

5 times

Answer

50 times

Question 8

Which of the following is not an advantage of reflecting telescopes

Accepted Answer

wider field of view

Answer

No chromatic aberration

Answer

Easier to handle

Answer

Greater angular magnification

Question 9

In chromatic aberration which colour is closest to the lens?

Accepted Answer

Blue

Answer

Red

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