Physics-
General
Easy

Question

The circular boundary of the concave mirror subtends a cone of half angle theta at its centre of curvature. The minimum value of theta for which ray incident on this mirror parallel to the principle axis suffers reflection more than one is

  1. 30°    
  2. 45°    
  3. 60°    
  4. 75°    

The correct answer is: 60°

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