Turning parallel rays into diffused rays, it looks just like a diffused ray emanating from a point ray at the focal point of a lens. They can be incorporated into optical systems to help extend the focal length, or simply used to diffuse light.
As a general rule, the concave side of a plano-convex lens faces the direction in which parallel or approximately parallel light rays come. The choice of plano-concave or biconcave is determined by the residual aberration of the optical system.
■Material: BK-7
BK Group glass has been widely used for a long time because it has good light transmittance up to short wavelengths, has few bubbles, striae, and discoloration, and is hard and scratch-resistant. Among them, BK7 is a relatively hard glass that is scratch resistant, easy to handle, and does not require any special treatment when polishing. The bubbles and inclusions contained in BK7 are 0.029 mm2 per 100 cm2, and it has good transmittance for wavelengths above 350 nm.
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