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In the visible region the dispersive powers and the mean angular deviations for crown and flint glass prisms are ω,ω and d,d respectively. The condition of getting dispersion wih zero deviation, when the two prisms are combined is :


( A ) ωd+ωd=0
( B ) ωd+ωd=0
( C ) ωd+ωd=0
( D ) (ωd)2+(ωd)2=0

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