Physics-
General
Easy

Question

An object ‘O’ is placed infront of a small plane mirrorM1 and a large convex mirrorM2 of focal length f The distance between ‘O’ and M1 is x and the distance between M1 and M2 is y The image of ‘O’ formed by M1 and M2 coincide The magnitude of ‘f’ is

  1. x minus y    
  2. fraction numerator x to the power of 2 end exponent minus y to the power of 2 end exponent over denominator 2 y end fraction    
  3. fraction numerator x to the power of 2 end exponent plus y to the power of 2 end exponent over denominator 2 y end fraction    
  4. fraction numerator x to the power of 2 end exponent plus y to the power of 2 end exponent over denominator x plus y end fraction    

The correct answer is: fraction numerator x to the power of 2 end exponent minus y to the power of 2 end exponent over denominator 2 y end fraction

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