Section 25A

_____ are instruments that form enlarged images of distant objects. 

Optical telescopes form images by gathering visible light using ___

• lenses

• radios

• mirrors

• x-rays

___ telescopes –bend light to produce an image.

• reflecting

• refracting

• radio

• space

___ telescopes –use disc-shaped mirrors to magnify an image

• reflecting

• refracting

• radio

• space

Radio waves from stars are ___

• extremely small (in wavelength)

• extremely large (in wavelength)

• invisible to our eyes

• brightly colored and can be clearly seen (on a dark night)

Space telescopes - these can observe the ____ spectrum that stars emit.

• visible light

• space

• multi dimensional

• electromagnetic

the electromagnetic spectrum (that stars emit) include:

• gamma

• infrared

• ultrablue

• x-rays

• ultraviolet

Why can't optical telescopes observe electromagnetic waves from stars?

• They are invisible

• The atmosphere blocks many of them

• The magnets in the telescope distort the image

• The surface of the Earth is much further than the orbit of the Earth (so it is too far away)

Which is a refracting telescope?

• A

• B

Circle the primary mirror of a reflecting telescope.