Most diamonds mined -- about 80% -- are industrial diamonds, and the application you're describing may be an industrial application. These diamonds are at least cloudy, opaque and not clear.
A gem-quality diamond could be fashioned into the focal object you require, depending on the size of the object you need. Remember that about 65% of any raw stone is lost in cutting, and most diamonds found are about as large as an edible pea.
Focus or the focal point.
It is the point at which light comes to a focus at a single point in space at a certain distance from the mirror relative to its curvature.
The main purpose of a laser is to focus electromagnetic radiation (light) on to a single point.
Convex lenses focus parallel light rays from distant sources such as the sun to a single point on the principal axis of the lens. This point is called the principal focus of the convex lens. A source such as the sun is producing enough energy to heat a substance if it is placed at the principal focus point.
Light from a single point of a distant object and light from a single point of a near object being brought to a focus by changing the curvature of the lens. The lens is a transparent, biconvex structure in the eye that, along with the cornea, helps to refract light to be focused on the retina.
Yes, it does focus light to form an image at the focal point and hence it is used in spectacles.
A light-half, I believe.
When light rays are converted on one point of focus is called compound light.
Convergent.
Answer #1 . . . convergenceAnswer #2 . . . focus
a 'focus'
it can do to the singurlity of a blackhole.