Light of wavelength λ = 450 nm passes through a single slit of width a = 0.32 mm. A diffraction pattern is formed on a screen L = 1.2 m away. Part (a)  Express the relative intensity, I/Imax, of the light at an angle θ in terms of θ, a and λ.  Part (b)  Calculate the value of I/Imax at an angle of θ = 28°.

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Interference of Light

The word "constructive" signifies addition in interference. Constructive interference occurs when the path of the waves that start from the slit differs by 1 entire wavelength or in the intervals of the same. Hence, the waves that are presented on the screen are in phase (crest to crest/trough to trough). The waves interfering constructively forms bright fringes on the screen.