Physics-
General
Easy

Question

A container is filled with water (mu = 1.33) upto a height of 33.25 cm. A concave mirror is placed 15 cm above the water level and the image of an object placed at the bottom is formed 25 cm below the water level. The focal length of the mirror is

  1. 10    
  2. 15    
  3. 20    
  4. 25    

The correct answer is: 20


    Distance of object from mirror
    = 15+fraction numerator 33.25 over denominator 4 end fraction cross times 3= 39.93 cm
    Distance of image from mirror =15 + fraction numerator 25 over denominator 4 end fraction cross times 3=33.75
    For mirror, fraction numerator 1 over denominator v end fraction plus fraction numerator 1 over denominator u end fraction equals fraction numerator 1 over denominator f end fraction
    Þ fraction numerator 1 over denominator negative 33.75 end fraction minus fraction numerator 1 over denominator 39.93 end fraction equals fraction numerator 1 over denominator f end fractionÞ f almost equal to negative 18.3 c m

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