Astronomical Telescope Quiz

What are the two main lenses in an astronomical telescope called?

• Concave lens and convex lens

• Objective lens and eyepiece

• Focal lens and magnifying lens

• Primary lens and secondary lens

Which lens in a telescope is designed to have higher power?

• Objective lens

• Eyepiece

• Neither has power

• Both have equal power

Why is the objective lens in a telescope designed to have lower power?

• To reduce the size of the telescope

• To increase the magnification

• To decrease the magnification

• To make the telescope lighter

What type of light rays does the objective lens focus to form an image?

• Parallel rays

• Converging rays

• Diverging rays

• Scattered rays

In a telescope, what is the image formed by the objective lens used as for the eyepiece?

• A new object

• A virtual image

• A real image

• A magnified image

What is the nature of the final image seen through an astronomical telescope?

• Virtual and upright

• Real and upright

• Real and inverted

• Virtual and inverted

Why is the image seen through a telescope inverted?

• Because the telescope is not aligned

• Because the image is virtual

• Because the objective lens inverts the image

• Because the eyepiece inverts the image

How is the distance between the two lenses in a telescope determined?

• By the magnification of the telescope

• By the focal lengths of the lenses

• By the diameter of the lenses

• By the power of the lenses

What is the formula for calculating the magnification of a telescope?

• Power of eyepiece / Power of objective lens

• Focal length of objective lens / Focal length of eyepiece

• Focal length of eyepiece / Focal length of objective lens

• Power of objective lens / Power of eyepiece

What happens to the magnification if the power of the objective lens is decreased?

• Magnification decreases

• Magnification remains the same

• Magnification becomes zero

• Magnification increases