Physics-
General
Easy

Question

In the figure shown find the total magnification after two successive reflections first on M subscript 1 end subscript & then on M subscript 2 end subscript

  1. + 1    
  2. – 2    
  3. + 2    
  4. – 1    

The correct answer is: + 2


    for M1: V = – 60 , m1 = –2 for
    M2: u = + 21. f = 10
    table row cell therefore fraction numerator 1 over denominator V end fraction plus fraction numerator 1 over denominator 20 end fraction equals fraction numerator 1 over denominator 10 end fraction rightwards double arrow V equals 20 end cell row cell therefore M subscript 2 end subscript equals negative fraction numerator 20 over denominator 20 end fraction equals negative 1 end cell row cell therefore M equals M subscript 1 end subscript cross times M subscript 2 end subscript equals plus 2 end cell end table

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