How the aberrations in  minimized in a reflecting telescope?

How the aberrations in  minimized in a reflecting telescope?

• By grinding a lens so that it protrudes more near the center and making some adjustments to the edges, the lens can correct for focusing at the edge and allow all light to align properly.
• By blocking rays from outer edges of a spherical lens by Aperture blades to reach the film
• By using combination of lenses of opposite nature (convex & concave) of different materials.

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