First slide

In a diffraction pattern due to a single slit of width a , the first minimum is observed at an angle 300when light of wavelength 5000 is incident on the slit. The first secondary maximum is observed at an angle of


For first minimum, the path difference between extreme waves, asinθ=λ

 Here θ=30°sinθ=12  a=2λ..........(1)

For first secondary maximum, the path difference between extreme waves

asinθ'=32λ or   (2λ)sinθ'=32λ [Using eqn (i)] 

 or sinθ'=34    θ'=sin-134

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