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Physics Medium FPSC PPSC NTS Uploaded: 13 Jul 2026

What is the principle behind a periscope?

  • A Reflection of light using two parallel mirrors
  • B Diffraction of light
  • C Refraction through lenses
  • D Polarisation of light
Correct Answer: Option A — Reflection of light using two parallel mirrors
Explanation:
A periscope uses two parallel mirrors inclined at 45 degrees to reflect light allowing observation above or around obstacles without direct line of sight.
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