As an admirer of Thomas Young, you perform a double-slit experiment in his honor

Question

As an admirer of Thomas Young, you perform a double-slit experiment in his honor. You set your slits 1.25 mm apart and position your screen 3.81 m from the slits. While Young had to struggle to achieve a monochromatic light beam of sufficient intensity, you simply turn on a laser with a wavelength of 633 nm. How far on the screen are the first bright fringe and the second dark fringe from the central bright fringe? Express your answers in millimeters. First bright fringe: ______ mm Second dark fringe: _____ mm

Explanation / Answer

first bright fringe

y=lD/d =633*10^-9 *3.23/?= ___ mm


second dark fringe

y=5/2 *lD/d =? mm

i cant answer this question because question is not clear...denominator is missing

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