ISRO Mechanical & Aerospace 2010 - Question 58

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Optical square is

  • A. Engineer's square having stock and blade set at 90°
  • B. A constant deviation prism having the angle of deviation... equal to 90°
  • C. A constant deviation prism having the angle of deviation... equal to 45°
  • D. Used to produce interference fringes

Answer: C. A constant deviation prism having the angle of deviation... equal to 45°

Explanation: Note: Standard optical squares deviate light by 90°. The source PDF selected option (c) which says 45°. This might be referring to the angle between the reflecting surfaces (which is 45°) causing a 90° deviation.

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