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BK7
Fused Silica |
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It is composed by two 30° dispersion prisms and a right angle prism. The mutual perpendicular surfaces are of the input and output surfaces. When a beam incident in one of the two surfaces (S1 & S2) at Brewster angle, then the beam will output at Brewster angle too from another surface, and beam is deviated 90 degree. It is often used as a dispersion prism. |