Calculate the dispersive power for crown and flint glass prism from the following data :For crown glass, `m_(b) = 1.522, m_(r ) = 1.514`. For flint glass, `mu'_(b) = 1.662, mu'_(r ) = 1.644`

Explanation

For crown glass
`mu_(v)=1.522" "mu_(R) : 1.514`
`:. Mu_(Y)=(mu_(V)+mu_(R))/2=(1.522+1.514)/2=1.518`
Hence, the dispersive power of crown glass
`omega=(mu_(V)-mu_(R))/(mu_(Y)-1)=(1.522-1.514)/((1.518-1))=0.01544`
`:. omega=0.01544`
For flint glass :
`mu'_(V)=1.662" "mu'_(R)=1.644`
`:. mu'=(mu_(V)+mu_(R))/2=(1.662+1.644)/2=1.653`
`:. omega'=(mu_(V)-mu_(R))/(mu'-1)=(1.662-1.644)/((1.653-1)=0.0276`