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Mention the conditions for diffraction minima and maxima. 

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Condition for secondary maxima is 

Angle of diffraction θ ≈ ( n + 1/2) λ/a where n = ±1, ±2, ±3....... 

Condition for diffraction minima: 

Angle of diffraction θ ≈ nλ/a where n = ±1, ±2, ±3....... 

where λ is wavelength of light used and a is slit width.

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