The BEST shape for the cross-section of a simple astronomical mirror in order to produce the sharpest images of very distant objects at its prime focus is a(n)
A) parabolic shape.
B) elliptical shape.
C) perfectly flat, smooth surface.
D) spherical shape.

Question

Quizplus · Accepted Answer

A parabolic shape is best for the cross-section of a simple astronomical mirror to produce the sharpest images of very distant objects at its prime focus because it focuses parallel rays of light (such as those coming from distant stars) to a single point, minimizing spherical aberration.

The BEST Shape for the Cross-Section of a Simple Astronomical