it reflects the sun rays with a mirror so that they are concentrated on a point or a line
The incoming light will intersect at a focal point determined by parabolic curve of the mirror.
concave mirror and convex lens can be used to focus light rays. they are also called converging mirror and lens respectively. They focus the light at a distance of its focal length.
this is a very good science project
because the thickness of air film is parallel to the edge
It is normally called a mirror.
Yes. Specifically, it's an f/8 parabolic mirror.
parabolic mirror is used in search light
Parabolic
parabolic reflectors
A parabolic mirror would do the job.
mirror with a concave parabolic figure
A reflecting telescope should have a parabolic mirror in which case there is no spherical aberration. The process of turning a spherical mirror surface into a parabolic one is called 'figuring'.
A parabolic mirror is shaped such that parallel incident light is reflected to a point called the focus. You will have to establish the size required, and the shape. There is an entry in Wikipedia on Parabola, giving the algebra.
Typically a concave parabolic mirror with a metallic reflector.
A single-mirror reflector.
A parabolic mirror, usually. A spherical mirror is also sometimes used, but that requires additional corrections in other parts of the telescope.
Probably parabolic (not 100% on that thou)