The mirrors or lenses in a telescope are called "optics" - Deepstash

The mirrors or lenses in a telescope are called "optics"

Powerful telescopes can see dim objects and objects that are really far away. To do that, the optics have to be really big. The bigger the mirrors or lenses, the more light the telescope can gather.

The mirrors and lenses of a telescope must be just the right shape to concentrate the light. They must be without spots, scratches or other flaws. 

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