Concave vs Convex Mirror: Know hеrе what is thе diffеrеncе bеtwееn Concave vs Convex Mirror. Concavе mirrors curvе inward and crеatе both rеal and virtual imagеs. Convеx mirrors ...

The first telescopes, known as refracting telescopes, were built in the early 17th century by Dutch eyeglass makers. They employed a pair of lenses—one convex fitted at the end of the scope, and ...

Galileo's device was a 20-magnification instrument that used a convex objective lens and a concave ocular lens. This design was the only real workable telescope of the day.

For a concave mirror the skewers point toward each other, and the reflected light rays spread out less. The reflection of an object close to the mirror is bigger and looks farther away.

That secondary mirror, in turn, bounced the light (and thus the image seen) into a convex eyepiece lens built into the side of the tube. This was the first working reflecting telescope.

Newton used a concave spherical mirror to make his reflecting telescope, a design that is still popular with amateur astronomers due to its simplicity, low cost and high degree of image quality.

Convex mirrors are small, round mirrors usually installed on the fender or hood of the truck. These mirrors have rounded, concave reflections, showing a little bit more of what's on the truck's sides.