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right angle prism
Dove prism, roof prism, Right angle prism, Penta prism, mirror, beamsplitters.
Penta Prism is a five-sided prism containing two reflecting surfaces at 45 degree to each other, and two refracting faces perpendicular to the entering and emerging beams.
The roof or Amici prism deviates or deflects the image through an angle of 90 degrees. It is a right-angle prism whose hypotenuse has been replaced by a 90-degree TIR roof.
When look through the prism and rotate it around a longitudinal axis, the image rotates through twice the angle the prism rotates through. Optimize performance by using collimated light.