Problem 14-10 Double Slit
A laser beam with light of wavelength 638.2nm is used to check a manufacturer's claim that a double slit has a separation of 0.200mm. The distance to the screen is 3.00m and the measured distance from the central maximum to the middle of the fourth minimum is 33.2mm. What is the measured slit separation?
[Ans. 0.202mm]
As usual we start with a good diagram. Which data set is correct?
| Solution | d | x | N | L |
|---|---|---|---|---|
| (A) | 2.00×10−3m | ? | 4 | 3m |
| (B) | ? | 33.2×10−3m | 4 | 3m |
| (C) | ? | 2.00×10−3m | 4 | 3m |
| (D) | 33.2×10−3m | ? | 4 | 3m |
