Question

How do refracting and reflecting telescopes differ?

Answer 1

Refractors use lens as primary objective where as reflectors parabolic mirrors are used as objectives.

Explanation:

Since refractors have many problems Sir Isaac Newtonn deviced the reflectors,.![![enter image source here]]

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THe diagrams give the details how a light ray enters the telescope
and how they are reflected and refracted in irrespective telescope.

Picture credit Science hpow stuff works.com
Bro ISU edu,
Chromatic aberration and spherical aberration are the two problems refactors have.