18-2: Telescopes

Question 1

telescope

Answer 1

an instrument that gathers electromagnetic radiation from the sky and concentrates it for better observation

Question 2

refracting telescope

Answer 2

a telescope that uses a set of lenses to gather and focus light from distant objects

Question 3

reflecting telescope

Answer 3

a telescope that uses a curved mirror to gather and focus light from distant objects

Question 4

electromagnetic spectrum

Answer 4

All of the frequencies or wavelengths of electromagnetic radiation

Question 5

disadvantage 1 of a refracting telescope

Answer 5

images cannot be perfectly focused

Question 6

disadvantage 2 of a refracting telescope

Answer 6

limited by size of objective lens, too large causes distortion

Question 7

advantage 1 of reflecting telescope

Answer 7

use of large mirrors gather more light

Question 8

advantage 2 of reflecting telescope

Answer 8

polished curved mirrors prevent light from entering the glass, so flaws in the glass do not affect the light for a clearer image

Question 9

advantage 3 of reflecting telescope

Answer 9

mirrors can focus all colors of light to the same focal point. Therefore, reflecting telescopes allow all colors of light from an object to be seen in focus at the same time

Question 10

what colors are shorter and longer wavelengths?

Answer 10

red- long wavelength, blue- short wavelength

Question 11

which radiation can pass through Earth’s atmosphere

Answer 11

X-rays, gamma rays, and some UV rays

Question 12

Why do we place telescopes in outer-space?

Answer 12

so it can be free of Earth’s pollutants and other chemicals in the atmosphere