1. Physical optics (2)
Submitted to
Dr. Mohammad Salah
Prepared by:
Ghayda’a Shaqour
2012-2013

2.  The experiment is named for
its inventor, Thomas Young
(1773-1829)
 This experiment strongly
demonstrates the wave nature
of light.

3.  Double slit  Screen
 Light beam

5. Particle Wave
 If light acts as a particle,  The light will diffract
only two slits will appear and interfere, making
on the screen many fringes

8. L1
Next Maxima
d Central Maxima
θ
L2
Γ

9.  Light hits two slits separated by 0.05 m. If 25.32
μm separates the bright fringes on the screen
that is 2m distant, what is the wavelength of
light being used?
D sin =mλ
m(1)
25.32 25.32 μm
0.05 —=
2 1 λ 0.05
m 2m m(0)
λ = 633nm

10.  Light behaves like a wave; interference
 We used this property to calculate the wavelength of
light
 Light also behaves like a particle
 This behavior is described in the dual wave/particle
theory

11.  http://skullsinthestars.com/2009/03/28/optics-basics-
youngs-double-slit-experiment/
 http://en.wikibooks.org/wiki/High_School_Chemistry
/The_Dual_Nature_of_Light
 http://bylaketahoe.com/Laboratory%20Experiments.h
tm#Experiment 1
 http://www.walter-fendt.de/ph14e/doubleslit.htm