Question

Orange light with ? = 615 nm strikes a pair of slits separated by 0.620 mm .

Part A: On a screen 1.40 m away, what's the distance between the central maximum and one of the fourth dark fringes?

Part B: On a screen 1.40 m away, what's the distance between the third bright fringe on one side of the central maximum and the third dark fringe on the other?

Express your answer with the appropriate units.

Answer 1

,

Part A

D = 1 4 m

As we know the position nth dark fringe from the central fringe is given by

PART B

Position of 3rd dark fringe from the center is

And the position of nth bright fringe from the center is

Hence total distance is

= 0.00416 + 0.0034

= 0.00756