Chpts. 3738: Interference of Light Waves - PowerPoint PPT Presentation

1 / 6
About This Presentation
Title:

Chpts. 3738: Interference of Light Waves

Description:

These coatings are applied to optical surfaces, like camera. lenses , to reduce the amount of light reflected, thus increasing ... – PowerPoint PPT presentation

Number of Views:115
Avg rating:3.0/5.0
Slides: 7
Provided by: resou1
Category:

less

Transcript and Presenter's Notes

Title: Chpts. 3738: Interference of Light Waves


1
Chpts. 37-38 Interference of Light Waves
2
Chapter 37-38CONSTRUCTIVE INTERFERENCE
To get constructive interference (bright fringes)
, the path difference D must obey this equation
3
Destructive Interference
To get destructive interference (dark fringes) ,
the path difference D must obey this equation
4
Two-slit interference
See Active Fig. 37.2 and 38.11 at pse6.com
5
The Diffraction Grating
See Active Figure 38.18 At pse6.com
6
Change of phase due to reflection
A light wave undergoes a phase change of 180
degrees upon reflection from a medium that has a
higher index of refraction than the one in which
the wave is initially travelling. This
effectively reverses the conditions for
constructive and destructive interference.
7
Interference in Thin Films
8
Anti-reflection coatings
These coatings are applied to optical surfaces,
like camera lenses , to reduce the amount of
light reflected, thus increasing light
transmission through the lens. Both reflected
rays undergo a phase change, thus the conditions
for constructive and destructive interference are
normal.
Here n represents index of refraction of the
non-reflective coating
Write a Comment
User Comments (0)
About PowerShow.com