Mr Johnston came and taught us what periscopes, are how they are used and who uses them. We found out that the angle of incidence equals the angle of reflection. Which means that if the light his the mirror at a 45 degree angle it reflects the light back at 45 degrees as well. This activity was fun for me because I finally found out how a periscope works. It was also fun to find out that in the war people used the periscope to find their enemies while in trenches. We also find out they attached it to guns, so they didn't get their head blown off.
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