Instructions for: Periscope/Retroscope

These two devices use mirrors to reroute the path of normal light.  The Periscope allows students to see from a perspective above, below, or beside their natural view, depending on the placement of the device.  The Retroscope shows them what is behind them.

Here are light ray diagrams, showing how these two devices work:

Click to enlarge diagram

Click to enlarge diagram



Questions for Students / Items of Interest:

Q1)  When you hold either device with its axis vertically, you see a normal view through it.   You also see a normal view with the axis horizontally.   But what happens if the axis is at some funny angle?



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