by sunlight maybe??
The periscope has a reflector to make the light turn corners
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A light bulb.
2.
well there really is no antonym that i know of for periscope because a periscope is an object.
someone discovered the periscope
The word "periscope" is a noun. It refers to a device used for seeing over obstacles or around corners, typically by the use of mirrors and lenses.
a diagram of a periscope
it is used to make piping and such
The periscope was invented in 1450 by Johann Gutenberg
Periscope Life was created in 1980.
Periscope Entertainment was created in 2004.