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Q: The working principle of optical square is based on
  • A. Reflection
  • B. double reflection
  • C. Refraction
  • D. Reaction
Correct Answer: Option B - Optical square – This instrument is used for perpendicular offset only. Principle of optical square – The angle between the incident ray and the reflected ray is twice the angle between the mirrors (Double reflection). • The optical square consists of a circular box 50 mm in diameter and 12.5 mm in depth.
B. Optical square – This instrument is used for perpendicular offset only. Principle of optical square – The angle between the incident ray and the reflected ray is twice the angle between the mirrors (Double reflection). • The optical square consists of a circular box 50 mm in diameter and 12.5 mm in depth.

Explanations:

Optical square – This instrument is used for perpendicular offset only. Principle of optical square – The angle between the incident ray and the reflected ray is twice the angle between the mirrors (Double reflection). • The optical square consists of a circular box 50 mm in diameter and 12.5 mm in depth.