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Reflecting telescopes are popular because they're

Amore powerful than a refracting telescope.
Bsmaller than a refracting telescope.
Ceasier to build than a refracting telescope.
Dmore durable than a refracting telescope.

Verified Answer :

Ceasier to build than a refracting telescope

Big mirrors used in reflecting telescopes are easier and cheaper to make than big lenses which would cost more because of the quality of glass required to make refracting telescopes

C. easier to build than a refracting telescope.