A) wavelength
B) pressure
C) area
D) volume
Correct Answer: C
Solution :
From the relation \[\mu =\frac{velocity\text{ }of\text{ }light\text{ }in\text{ }vacuum}{velocity\text{ }of\text{ }light\text{ }in\text{ }medium}\] Therefore, refractive index\[\mu \]is dimensionless, so each term on right hand side is dimensionless. Hence,\[\frac{\beta }{{{\lambda }^{2}}}\]is dimensionless. This implies that dimensions of\[\beta \]will have the dimensions of\[{{\lambda }^{2}}\]. i.e., of\[c{{m}^{2}}\]or area.
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