Why do fringes appear sharper with more slits in multiple slit diffraction?

Click For Summary
SUMMARY

The discussion centers on the phenomenon of sharper fringes in multiple slit diffraction as the number of slits increases. Participants agree that adding more slits enhances constructive interference at specific locations while increasing destructive interference elsewhere. This leads to thinner and sharper fringes due to the greater number of constraints imposed on the conditions for constructive interference. The key takeaway is that more slits result in a more defined pattern of light and dark fringes.

PREREQUISITES
  • Understanding of wave interference principles
  • Familiarity with the concept of constructive and destructive interference
  • Knowledge of multiple slit diffraction patterns
  • Basic grasp of optics and light behavior
NEXT STEPS
  • Study the mathematical derivation of multiple slit diffraction patterns
  • Explore the role of slit width and spacing in interference patterns
  • Learn about the applications of diffraction in optical instruments
  • Investigate the impact of wavelength on fringe sharpness in diffraction experiments
USEFUL FOR

Students of physics, optical engineers, and educators looking to deepen their understanding of wave optics and diffraction phenomena.

doubledouble
Messages
6
Reaction score
0
Could anyone explain why it is that as more slits are added the fringes appear sharper?

Thanks
 
Science news on Phys.org
As a random shot, i would guess its because there is more superposition on the locations that should have constructive superposition, and there's more destructive interference in the positions that shouldn't have light, resulting in a sharper frindge.

This is my guess though
 
AbedeuS said:
As a random shot, i would guess its because there is more superposition on the locations that should have constructive superposition, and there's more destructive interference in the positions that shouldn't have light, resulting in a sharper frindge.
This is pretty much on the mark, even if it is a little hand-wavey - essentially having more slits introduces more constraints when it comes to meeting conditions for constructive interference. This results in thinner fringes because at some small distance away from an interference maxima, there are more destructively-interfering contributions the more slits you have.

Claude.
 

Similar threads

Undergrad Single-Slit Diffraction -- Deriving the relation for the minima
  • · Replies 8 ·
Replies
8
Views
3K
High School Explanation for bright fringes in Single Slit Diffraction
  • · Replies 4 ·
Replies
4
Views
2K
High School Number of fringes in a 2-slit diffraction pattern
  • · Replies 6 ·
Replies
6
Views
5K
Undergrad Double slit displaying anti-fringes?
  • · Replies 8 ·
Replies
8
Views
21K
Undergrad Double slit fringe visibility with sunlight
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad Calculating Intensity in Single Slit Diffraction Experiments
  • · Replies 17 ·
Replies
17
Views
3K
Graduate Do Multiple Diffraction Gratings Affect Interference Patterns?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Amplitude of the maximums in single slit diffraction
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad The double-slit experiment with a pit in the screen
  • · Replies 33 ·
2
Replies
33
Views
4K
Undergrad Optics : interference and diffraction
  • · Replies 5 ·
Replies
5
Views
3K