1. Young’s Double Slit Experiment

2. Young’s double slit © SPK

3. Path difference:

5. For a bright fringe, For a dark fringe, m: any integer

6. For two beams of equal irradiance (I 0 )

7. Visibility of the fringes (V) Maximum and adjacent minimum of the fringe system

9. http://micro.magnet.fsu.edu/primer/lightandcolor/interferenceintro.html Thomas Young's Double Slit Experiment

10. Photograph of real fringe pattern for Young’s double slit

11. The two waves travel the same distance –Therefore, they arrive in phase S S'S'

12. The upper wave travels one wavelength farther –Therefore, the waves arrive in phase S S'S'

13. The upper wave travels one-half of a wavelength farther than the lower wave. This is destructive interference S S'S'

14. Young’s Double Slit Experiment provides a method for measuring wavelength of the light This experiment gave the wave model of light a great deal of credibility. Uses for Young’s Double Slit Experiment

15. Fresnel double mirror P1 P2 © SPK

16. Fresnel biprism © SPK

17. Lloyd’s mirror © SPK

18. Billet’s split lens © SPK

19. For a bright fringe, For a dark fringe, Extra phase difference ±  in Lloyd’s mirror

20. Wavefront splitting interferometers Young’s double slit Fresnel double mirror Fresnel double prism Lloyd’s mirror

21. 1. Optics Author: Eugene Hecht Class no. 535 HEC/O Central library IIT KGP