Orange
reflecting telescope gathers light from mirror
The telescope is cylindrical. Its primary mirror is concave.
multiple-mirror telescope OPTICAL ;p
The diameter of the concave mirror.
a concave mirror and an angled plane mirror
A hole at one end, a mirror at the other.
reflecting telescope gathers light from mirror
A parabolic mirror, usually. A spherical mirror is also sometimes used, but that requires additional corrections in other parts of the telescope.
A reflecting telescope.
The telescope is cylindrical. Its primary mirror is concave.
multiple-mirror telescope OPTICAL ;p
A reflecting telescope is different from a refracting telescope because a reflecting telescope uses a concave lens, a plane mirror, and a convex lens. While a refracting telescope uses two lens.
mirror with a concave parabolic figure
A reflecting telescope.
The diameter of the concave mirror.
a concave mirror and an angled plane mirror
Concave mirror of a reflecting telescope