Multiple choice

A common periscope is used to see outside objects above the water surface from inside a submarine. For deflection of light, it uses

  1. optical fibers

  2. inclined mirrors

  3. total internal reflection

  4. total internal refraction

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

 A common periscope is used to see outside objects above the water surface from inside a submarine. For deflection of light, it uses  total internal reflection