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If we switch from green laser (lambda=532 nm) to red laser (lambda=670 nm) in a Young's...

If we switch from green laser (lambda=532 nm) to red laser (lambda=670 nm) in a Young's Double Slit Diffraction experiment, then what happes to the fringe pattern?

a. nothing

b. position of the principle maxima changed by 138 nm

c. seperation between fringes increases

d. seperation between fringes decreases

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