9-10 cm
a diagram of a periscope
someone discovered the periscope
well there really is no antonym that i know of for periscope because a periscope is an object.
a periscope
The periscope was invented in 1450 by Johann Gutenberg
Periscope Life was created in 1980.
Periscope Entertainment was created in 2004.
The periscope was invented in 1450 by Johann Gutenberg.
You can use the word Periscope a few ways in a sentence. You can write the sentence I am going to periscope the website.
The duration of Down Periscope is 1.55 hours.
The duration of Up Periscope is 1.87 hours.
The length of the periscope does not affect the size of the image seen. The size of the image is determined by the mirrors inside the periscope that reflect the light, not the length of the periscope itself.