Answer:
Early telescopes focused light using pieces of curved, clear glass, called lenses. However, most telescopes today use curved mirrors to gather light from the night sky. The shape of the mirror or lens in a telescope concentrates light. That light is what we see when we look into a telescope.
how to work one
Aim the telescope at an astronomical target. Pick a bright object, such as the moon or a star. Raise or lower the tube, and move it from side to side to point the telescope in the target’s general direction. Look through the finder scope. Adjust the orientation of the telescope to center the object in the finder scope.
hope it helped have a nice day <3 ^_^