Two slits separated by 0.10 mm are illuminated with green light (λ = 540 nm). Calculate the distance (in cm) from the central bright-region to the fifth bright band if the screen is 1.0 m away.
A) 2.3
B) 2.5
C) 2.7
D) 2.1
E) 2.0

Question

Quizplus · Accepted Answer

The distance from the central bright region to the nth bright band is given by
y_n = nλL/d
where L is the distance to the screen and d is the slit separation. Plugging in the given values, we have
y_5 = 5(540 nm)(1.0 m)/(0.10 mm) = 2.7 cm, which corresponds to answer choice C.

Two Slits Separated by 0