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Which of the following statement is not true for interference and diffraction?

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Important Questions on Wave Optics

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Physics Crash Course NEET>Chapter 18 - Wave Optics>Level 3>Q 6
The 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 and θ is the angular position):
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Physics Crash Course NEET>Chapter 18 - Wave Optics>Level 3>Q 7
Light of wavelength 6328 Å is incident normally on slit having a width of 0.2 mm. The width of the central maximum measured from minimum to minimum of diffraction pattern on a screen 9.0 meters away will be about-
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Physics Crash Course NEET>Chapter 18 - Wave Optics>Level 3>Q 8
Find the distance up to which light of wavelength 600 nm can travel such that its spread is less than the size of an 2 mm aperture upon which it is incident.
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Physics Crash Course NEET>Chapter 18 - Wave Optics>Level 3>Q 9
White light is used in Young's double slit experiment then the first maxima for infrared light would be
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Physics Crash Course NEET>Chapter 18 - Wave Optics>Level 3>Q 10

A slit of width d is illuminated by a parallel beam of light of wavelength 500 nm and diffraction pattern is observed on a screen kept at a distance of 1 m.  It is observed that the first minima is at a distance of 2.5 mm  from the centre of the screen. Find the value of d.