L$8\mathrm{.}3-8\mathrm{.}4$ Double Slit Interference

$2$ points possible $($graded$)$

Red light $()$ is used in Young$$s experiment according to the drawing.

$($L$8\mathrm{.}3)$ What is the total phase difference between the waves from the two slits at the location of the third $()$ bright fringe?

zero radians

radians

radians

radians

radians

unanswered

$($L$8\mathrm{.}4)$ What is the path length difference between the two waves at the $3$rd dark fringe seen on a screen?

$2\mathrm{.}5$

$3$

$3\mathrm{.}5$

$4$

Something else

unanswered

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