Exam-style question
Try this first
In a double-slit experiment, if the distance between the slits is 0.1 mm and the wavelength of light used is 500 nm, what is the fringe spacing on a screen 1 m away?.
- A.0.5 mm
- B.0.1 mm
- C.0.2 mm
- D.0.3 mm
Model answer
What a good answer should say
- 0.5 mm
Explanation
Why this works
Using the formula for fringe spacing, y = λL/d. Substituting gives y = (500 x 10^-9 m)(1 m) / (0.1 x 10^-3 m) = 0.005 m = 0.5 mm.
This shows how wavelength and slit separation affect interference patterns.
Common mistake
No common mistake is linked to this question yet.