Find the angular radius of the tenth bright fringe in a Michelson interfer- ometer when the central-path difference (2d) is (a) 1.50 mm and (b) 1.5 cm. The orange light of a krypton arc is 6057.8 ˚Aand that the interferometer is adjusted in each case so that the first bright fringe forms a maximum at the center of the pattern. Ans: (a) 4.885◦ , (b) 1.542◦

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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.