First slide
Diffraction
Question

Angular width of the central maxima in the Fraunhofer diffraction for λ = 6000 A0 is θ0 . When the same slit is illuminated by another monochromatic light, the angular width decreases by 30%. The wavelength of this light is

Easy
Solution

 As θ=2λa

θ0=2×6000a   ....(i)

θ'θ0=λ'6000  ....(ii)

λ'=0.7×6000  as θ'=0.7θ04200Ao

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