Problem 14-10 Double Slit - B

A laser beam with light of wavelength $638.2\; nm$ is used to check a manufacturer's claim that a double slit has a separation of $0.200\; mm.$ The distance to the screen is $3.00\; m$ and the measured distance from the central maximum to the middle of the fourth minimum is $33.2 \;mm.$ What is the measured slit separation?
[Ans. $0.202 \;mm$]

Accumulated Solution

Correct!

The relation for a minimum in double slit interference is:

(A)   $x/L = M\lambda/d$

(B)   $x/L = (N-1) \lambda/d$

(C)   $x/L = (N-½)\lambda/d$