In the grain -size determination using standard charts, the relation between the given size number n and the average number of grains 'N' per square inch at a magnification of 100 X is
  • a)
    N = 2n  
  • b)
    N = 2n-1
  • c)
    N = 2n + 1  
  • d)
    N = 2n + 1   
Correct answer is option 'B'. Can you explain this answer?

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