In a double-slit experiment, constructive interference is achieved when two waves reach the screen shifted by an integer number of wavelengths ±2λ.
The waves are in phase at this point.
The amplitudes of the waves add up and the resulting fringe is bright since the intensity of light is at maximum.
The figure shows the interference pattern obtained in a double-slit experiment with light of wavelength λ.
Identify the fringe or fringes that result from the interference of two waves whose phases differ by exactly 2λ.
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