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Q.

In a diffraction pattern due to a single slit of width 'a', the first minimum is observed at an angle 300 when light of wavelength 5000 A0 is incident on the slit. The first secondary maximum is observed at an angle of :

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a

sin-114

b

sin-123

c

sin-112

d

sin-134

answer is D.

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Detailed Solution

For the first minima,θ=ηλa⇒sin30°=λa=12First secondary maxima will be at.sinθ=3λ2a=3212⇒θ=sin-134

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In a diffraction pattern due to a single slit of width 'a', the first minimum is observed at an angle 300 when light of wavelength 5000 A0 is incident on the slit. The first secondary maximum is observed at an angle of :