The object used to view the outside from inside the submarine is called a periscope.
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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A device used to view a sequence of moving pictures is a projector. Projectors display images or videos onto a screen or surface, allowing viewers to see dynamic content in larger formats. They are commonly used in cinemas, classrooms, and presentations. Another example is a television, which also plays moving pictures through broadcasting or streaming services.
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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.
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 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.
Periscopes allow a submarine, when submerged at a shallow depth, to search visually for nearby targets and threats on the surface of the water and in the air. When not in use, a submarine's periscope retracts into the hull.
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.
The periscope is used primarily to view the surface of the water around the submarine, as well as to transmit Morse code messages to other subs or ships in the vicinity.