You perform a double-slit experiment in order to measure the wavelength of the n

Question

You perform a double-slit experiment in order to measure the wavelength of the new laser that you received for your birthday. You set your slit spacing at 1.17 mm and place your screen 8.43 m from the slits. Then you illuminate the slits with your new toy and find on the screen that the tenth bright fringe is 5.00 cm away from the central bright fringe (counted as the zeroth bright fringe). What is your laser's wavelength expressed in nanometers?

I already posted this once and they gave me the wrong answer at 493nm. Please assist if you know the subject

Explanation / Answer

Wavelength = a*d/(m*D)

where a = distance from central fringe on screen

d = slit spacing

m = order of fringe

D = slit to screen distance

Wavelength = (1.17*10^-3*5*10^-2)/(10*8.43) = 693.95 nm

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