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1. Two very narrow slits are spaced 1.85 umum and are placed 40.0 cmcm 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 with a wavelength of 551 nmum? (Hint: The angle QQ in
equation dsino=(m+12)Adsin(m+12)A is not small.)
Ans should be in meters

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