The primary mirror in an astronomical telescope must be a
A)half-silvered mirror.
B)convex mirror.
C)concave mirror.
D)plane mirror.

Question

Quizplus · Accepted Answer

A concave mirror is commonly used as the primary mirror in astronomical telescopes. This is because it has the ability to focus incoming light at a single point, which allows for clear and sharp images of distant objects in space. A convex mirror would cause the light to diverge, making it unsuitable for use as a primary mirror. Half-silvered and plane mirrors are not typically used as primary mirrors in astronomical telescopes.

The Primary Mirror in an Astronomical Telescope Must Be a