The object used to view the outside from inside the submarine is called a periscope.
Eyeballs, mainly.
An output device is a device which is used to view data given out by a computer, be it a printer, monitor or speaker.
An anorthoscope is an optical device, sometimes used as a toy, used to view distorted figures.
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The view through a submarine's periscope was just like looking through an optical telescope - it needed light to enter the lens to allow the user to see in detail what was in front of the periscope.
A Bushnell telescope is used to view celestial objects in space. These telescopes may be used as a hobby to view the stars or as an educational device if you're a student.
When the submarine is upto 20 meters from the surface they use a periscope which is simply 2 pieces of glass at 45 degrees to each other. similar to the periscope used to view from a trench by the army.
A fluoroscope is a device used to view continuous live X-ray images on a fluorescent screen.
A fluoroscope is a device used to view continuous live X-ray images on a fluorescent screen.
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