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Q: The principle of working of optical square is based upon..............
  • A. Reflection/परावत्र्तन
  • B. Refraction/अपवर्तन
  • C. Double reflection/दोहरा परावर्तन
  • D. Double refraction/दोहरा अपवर्तन
Correct Answer: Option C -
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Explanations:

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