In a Young\'s double-slit experiment, two rays of monochromaticlight emerge from

Question

In a Young's double-slit experiment, two rays of monochromaticlight emerge from the slits and meet at a point on a distantscreen. The point on the screen where these two rays meet is theeighth-order bright finge. The different in the distances that thetwo rays travel is 4.57E-6m. What is the wavelength (in nm) of themonochromatic light? Please Help me...I'm not sure where to start. In a Young's double-slit experiment, two rays of monochromaticlight emerge from the slits and meet at a point on a distantscreen. The point on the screen where these two rays meet is theeighth-order bright finge. The different in the distances that thetwo rays travel is 4.57E-6m. What is the wavelength (in nm) of themonochromatic light? Please Help me...I'm not sure where to start.

Explanation / Answer

for double slit interference:    pathdifference = m . In your case, you are given the path differenceand   m = 8    (eighth order brightfringe)   so .           4.57 x10-6 = 8 . =    5.713 x 10-7 m =  571.3 nm   is the wavelength

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