Arre, that's textbook stuff, yaar. Fringe width beta is (wavelength * distance to screen) / slit separation. You gave me lambda and d, but without the screen distance D, we can't get the exact number in metres.
Makes me think of my caliper at the assembly line, you know? The difference between a part being 10.00 mm and 10.02 mm is the difference between a smooth engine and a seized one. Your formula is perfect, but without that last measurement, it's just theory. The real answer is in the full set of numbers, always.
#exams#study
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