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| Answer» 67)Solution : As `mu = ("Velocity of light in vaccum")/("Velocity of light in medium")`, hence `mu` is dimensionless. Thus , each TERM on the RHS of given EQUATION should be dimensionless , I,e, `B // lambda^(2)` is dimensionless, i.e., `B` should have dimension of `lambda^(2)`, i.e., `cm^(2)`, i.e., area.68)OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO I HAVE NO TIME OOO OOOOOO | |