A screen is illuminated by monochromatic light whose wave lenght is ?, as shown

Question

A screen is illuminated by monochromatic light whose wave lenght is ?, as shown in the figure below.

The distance from the slits to the screen is L.

At the sixth bright fringe on the screen (position y on the screen), delta (the corresponding path length difference) and phi (the phase angle difference) is given by delta = 5/2 lambda and phi = 5pi. Lambda = 11/2 lambda and phi = 11pi. Lambda = 6lambda and phi = 12pi. lambda = 7/2 lambda and phi = 7pi. lambda = 4lambda and phi = 8pi. lambda = 13/2 lambda and phi = 13pi. lambda = 7lambda and phi = 14 pi. lambda = 5 lambda and phi = 10 pi. lambda = 2 lambda and phi = 4 pi. lambda = 3/2 lambda and phi = 3pi.

Explanation / Answer

It is option 3:

delta = 6*lambda
phi = 2 pi * 6 = 12 pi [ANSWER, OPTION 3]

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