In a two-slit interference experiment with the sits 0041 mm, Ask an Expert

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In a two-slit interference experiment, with the sits 0.041 mm apart and screen at a distance 75 cm, the 5th bright fringe out from the central bright band is found to be 4.75 cm from the centere of the screen.

a) What is the wave length of the light?

b) How far away from the central maxima is the 8th dark fringe?

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