Question: Monochromatic light ( = 500 nm) passes through two slits and onto a screen 2.5 m away. (a) If two nearby bright fringes are separated

Monochromatic light (λ = 500 nm) passes through two slits and onto a screen 2.5 m away. 

(a) If two nearby bright fringes are separated by 12 mm, what is the slit spacing? 

(b) If the slit spacing is reduced by a factor of three, what is the new distance between bright fringes?

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