Design and Technology Level 1
Periscope
Periscopes are used to view objects which cannot be observed normally using a direct line of sight, due to some restrictions. For example, periscopes are used by submarines to view objects above the sea.
A periscope works on the principle of Reflection of Light. Two mirrors are used, which are placed inside a tube, at an angle of 45 degrees. The incident and reflected rays of light enable the viewer to see the distant object.
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