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Q: .............is used in periscope
  • A. plane mirror
  • B. prism
  • C. concave lens
  • D. convex lens
Correct Answer: Option A - Plane mirrors are used in a reflecting periscope. Two plane mirror are fixed at the bends of the tube at an angle of 45⁰ with the side of the tube
A. Plane mirrors are used in a reflecting periscope. Two plane mirror are fixed at the bends of the tube at an angle of 45⁰ with the side of the tube

Explanations:

Plane mirrors are used in a reflecting periscope. Two plane mirror are fixed at the bends of the tube at an angle of 45⁰ with the side of the tube