Scientists use telescopes to study the various components of the universe. A telescope forms enlarged images of distant objects. There are many different types of telescopes. What is the main difference between the different types of telescopes?

A. The number of mirrors located in each telescope
Incorrect. The number of mirrors located inside telescopes may vary, but this is not the main difference between the different types of telescopes.

B. The number of lenses located in each telescope
Incorrect. The number of lenses located inside telescopes may vary, but this is not the main difference between the different types of telescopes.

C. The type of electromagnetic radiation detected by the telescope
Correct! Each type of telescope detects a specific type of electromagnetic radiation.

D. The type of computer used to interpret the data from the telescopes
Incorrect. Computers are used to interpret data from telescopes, but this is not the main difference between the different types of telescopes.

What is the main difference between refracting and reflecting telescopes?

A. A refracting telescope has three lenses while a reflecting telescope has four.
Incorrect. The number of lenses is not the main difference between refracting and reflecting telescopes.

B. A refracting telescope can view objects close to Earth while a reflecting telescope can see objects farther from Earth.
Incorrect. Distance of objects that can be viewed is not the main difference between refracting and reflecting telescopes.

C. A refracting telescope uses a glass lens as its objective while a reflecting telescope uses a mirror as its objective.
Correct!

D. A refracting telescope uses a small mirror as its objective while a reflecting telescope uses a large mirror as its objective.
Incorrect. A refracting telescope uses a glass lens as its objective while a reflecting telescope uses a mirror as its objective.

Which relationship is correct concerning mirror size and amount of light collected by a telescope?

A. The larger the mirror the more light collected
Correct!

B. The smaller the mirror the more light collected
Incorrect. In telescopes the larger the mirror the more light the telescope can collect.

C. The larger the mirror the less light collected
Incorrect. In telescopes the larger the mirror the more light the telescope can collect.

D. There is no relationship between mirror size and amount of light collected.
Incorrect. In telescopes the larger the mirror the more light the telescope can collect.

The type of telescope pictured below, that collects and reflects electromagnetic waves to a focus point or antenna, is a(n) —

A. Optical Telescope
Incorrect. Optical telescopes reflect or reflect light from the visual spectrum.

B. X-Ray Telescope
Incorrect. X-Ray telescopes use X-rays to produce images.

C. Gamma Ray Telescope
Incorrect. Gamma Ray telescopes are used to detect Gamma Ray waves given off by objects in space.

D. Radio Telescope
Correct!