Light of wavelength λ (in free space) propagates through a dispersive medium with refractive index n(λ)=1.5 + 0.6λ. the group velocity of a wave travelling in

Light of wavelength λ (in free space) propagates through a dispersive medium with refractive index n(λ)=1.5 + 0.6λ. The group velocity of a wave travelling inside this medium in units of 108 m/s is (A) 1.5 (B) 2.0 (C) 3.0 (D) 4.0 Q.26 The maximum number of intensity minima that can be observed in the Fraunhofer