A Right-Angle
Prism is used as a mirror to deviate light through 90 degree,
and also as a retroreflector to deflect light throgh 180
degree by total internal reflection.
90-degree
Deflection
90 degree deflection occurs at the
hyotenuse face.The image is erected and reversed.
180-degree
Deflection 180
degree deflection uses with hypotenuse as the entrance and
exit face.The mail application of it is used as a retroreflector
provided that the plane of incident beam includes the vertex.
