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BK7 Double Concave Lens

BK7 Double Concave Lens
Double concave lens is similar with plano concave lens. The focus length is negative. It can make parallel light diverge outside. The two sides have same radius of curvature. Double convex lens ...

Penda Prisms

Penda Prisms
Penta prism is a prism which makes the incident light accurately realize 90 degree reflection. Aluminum is coated on two reflective surfaces to improve reflectivity. It has two functions: 1. No ...

Holographic Grating

Holographic Grating
Holographic Grating The holographic grating is formed by the interference of two interfering laser beams to form fringes, and is exposed on a polished negative, and a sinusoidal pattern is formed on ...
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