Question: A red laser beam ((lambda=647 mathrm{~nm})) is sent through a double slit to a screen that is (15 mathrm{~cm}) wide and (2.00 mathrm{~m}) away from

A red laser beam $(\lambda=647 \mathrm{~nm})$ is sent through a double slit to a screen that is $15 \mathrm{~cm}$ wide and $2.00 \mathrm{~m}$ away from the slits.

(a) If the separation distance between the slits is $200 \mu \mathrm{m}$, how many bright fringes appear on the screen?

(b) Verify your answer to part $a$ by calculating the distance between the adjacent bright fringes.

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