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Using Total Internal Reflection of Light to Make a Periscope.

Two right angle prisms can be used to make a periscope.
At the back face of the prisms there is total internal reflection.
Please see the picture below.

Total Internal Reflection of Light in a Periscope

What are the Uses of a Periscope?

A periscope may be used by people

1. In a submarine to see above the sea surface.

2. To see over the heads of people in a crowd.

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