Expression for refractivity is given by ___________ – McqOptions

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1.	Expression for refractivity is given by ___________
A.	N=(n-1) 10<sup>6</sup>
B.	N=(n-1) 10<sup>-6</sup>
C.	N=1/(n-1)
D.	N= ( frac{1}{n-1} ) 10<sup>-6</sup>
Answer» B. N=(n-1) 10<sup>-6</sup>

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