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Two very narrow slits are spaced 1.80 mu...

Two very narrow slits are spaced `1.80 mu`m apart and are placed 35.0 cm from a screen. What is the distance between the first and second dark lines of the interference pattern when the slits are illuminated with coherent light of `lambda = 550nm ?` (Hint : The angle `theta` is not small).

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[12.6 cm]
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