Question: A red laser beam ((lambda=650 mathrm{~nm})) is sent through a double slit to a screen that is (400 mathrm{~mm}) wide and (1.00 mathrm{~m}) away from

A red laser beam $(\lambda=650 \mathrm{~nm})$ is sent through a double slit to a screen that is $400 \mathrm{~mm}$ wide and $1.00 \mathrm{~m}$ away from the slits.

(a) If the separation distance between the slits is $4000 \mathrm{~nm}$, how many bright fringes appear on the screen?

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

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