Physics-
General
Easy

Question

A square ABCD of side 1mm is kept at distance 15 cm infront of the concave mirror as shown in the figure. The focal length of the mirror is 10 cm. The length of the perimeter of its image will be :

  1. 8 mm    
  2. 2 mm    
  3. 12 mm    
  4. 6 mm    

The correct answer is: 12 mm


    table row cell v equals negative 30 comma m equals negative fraction numerator v over denominator u end fraction equals negative 2 end cell row cell therefore A to the power of ´ end exponent B to the power of ´ end exponent equals C to the power of ´ end exponent D to the power of ´ end exponent equals 2 cross times 1 equals 2 m m end cell row cell text end text text N end text text o end text text w end text text end text fraction numerator B to the power of ´ end exponent C to the power of ´ end exponent over denominator B C end fraction equals fraction numerator A to the power of ´ end exponent D to the power of ´ end exponent over denominator A D end fraction equals fraction numerator v to the power of 2 end exponent over denominator u to the power of 2 end exponent end fraction equals 4 end cell row cell rightwards double arrow B to the power of ´ end exponent C equals A to the power of ´ end exponent D equals 4 m m end cell row cell therefore text end text text l end text text e end text text n end text text g end text text t end text text h end text text end text equals 2 plus 2 plus 4 plus 4 equals 12 m m end cell end table

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