Question

Is it possible for the submarines to survive without a periscope? If no, then why?​

Answer 1

Answer:

No, Navy submarines don't have windows or portholes so the crew can watch undersea life. Submarines have only periscopes for outside vision, and those are only used close to the surface, a periscope depth (PD).

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Answer 2

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Modern submarines are no longer built with the single rotating, one-person-at-a-time periscope that we're used to seeing in the movies. Instead, periscopes aboard the U.S. Navy's Virginia-class subs consist of two 360-degree rotating photonics masts with high-resolution cameras.

Submarines have periscopes so that people inside can what is on the surface of the water. A periscope is a useful example of the law of reflection at work. It's important that your mirrors are placed at a 45° angle, because light always reflects away from a mirror at the same angle that it hits it.