NEET Physics Wave Optics Questions Solved

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Direction of the first secondary maximum in the Fraunhofer diffraction pattern at a single slit is given by (a is the width of the slit) 

(1) asinθ=λ2

(2) acosθ=3λ2

(3) asinθ=λ

(4) asinθ=3λ2

(4) For nth secondary maxima path difference

dsinθ=(2n+1)λ2asinθ=3λ2

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