In a doubles slit experiment with slit separation 0.850mm and the wavelength 600nm and the screen seperation is 2.80m. Discuss the following about the interference pattern obtained on scree 2.5mm away from the central bright fringe (i) it is dark/bright (ii) the order (n) of the fringe (iii) The intensity ratio at this point to max intensity of the bright fringe

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A: Given: 1 Wavelength of light = 580 nm Slit distance = 0.05 mm = 5 X 10-5 m

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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.