Does the pentaprism internally reflect the light rays
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Hey.
Here is the answer.
No, the reflections inside the pentaprism are not caused by total internal reflection.
Since the beams are incident at an angle less than the critical angle (the minimum angle for total internal reflection).
Instead, the two faces are coated to provide mirror surfaces.
The two opposite transmitting faces are often coated with an antireflection coating to reduce spurious reflections.
The fifth face of the prism is not used optically but truncates what would otherwise be an awkward angle joining the two mirrored faces.
Thanks.
Here is the answer.
No, the reflections inside the pentaprism are not caused by total internal reflection.
Since the beams are incident at an angle less than the critical angle (the minimum angle for total internal reflection).
Instead, the two faces are coated to provide mirror surfaces.
The two opposite transmitting faces are often coated with an antireflection coating to reduce spurious reflections.
The fifth face of the prism is not used optically but truncates what would otherwise be an awkward angle joining the two mirrored faces.
Thanks.
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