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Homework Statement
For light from a discharge lamp, the first-order bright fringe is observed at a perpendicular distance of 2.35cm from the mid-point of the slits, when the slit-to-screen distance is 1.2m and the slit separation is 0.03mm. What is the wavelengh of the light from the lamp?
Homework Equations
Wavelength = xd/D
The Attempt at a Solution
x = 0.0235m, d = 0.00003m, D = 1.2m
Wavelength = xd/D = (0.0235x0.00003)/1.2 = 7.05x10^-7/1.2 = 5.875x10^-7m
Not quite sure where I've gone wrong ..or if I was even on the right path. If you could offer some assistance it would be much appreciated :) (p.s. hi, nice forum ^^)