dispersive power not in syllabus... so sorry dear :(
two incident monochromatic waves whose wavelength differ by a small amt dλ are separated angularly atθ and θ+dθ wrt the incidence ray .the dispersive power is given by
(a)dθ/dλ
(b)dθ/θ
(c)dλ/λ
(d)λ(dλ/dθ)
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