Telescope: a device that collects light and makes distant objects appear closer and larger.
Refraction: the bending of waves as they go from one substance to another.
Reflection: the bouncing of waves off a surface.
Wavelenght: the distance from one peak to the next on a wave.
Frequency: the number of wavs that pass through a point in a second.
Electromagnetic spectrum: waves of light in order by wave-lenght.
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