As light passes from air into a dense but transparent material it
*Refraction of light at a surface between two transparent substances occurs because
the speed of light is different in the two materials.
*A typical refracting telescope is made up of
a long-focal-length lens at the front and a short-focal-length lens at the rear (next to your eye as you look through the telescope).
The main reason for building large optical telescopes on Earth's surface is
to collect more light from faint objects.
*The light-gathering power of a telescope is related directly to the
area of its primary mirror or lens.
What is chromatic aberration in a telescope?
*The light of different colors comes to a focus at different points inside the telescope.
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