# Lab III - Lab III Light A Wave or Particle Purpose The...

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Lab III Light: A Wave or Particle?

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Purpose: The purpose of this experiment was to the prove that light can act as wave and has certain wavelength. The objective was to determine the wavelength of green and red light using Young Slit experiment. Theory: In destructive interference, the interference occurs at point P on the screen and the wavelength from the slit S1 and S2 is given by (n-1/2)λ while in constructive interference the wavelength id nλ. PS 1 2 = PC 2 + CS 1 2 = PC 2 + (AC – AS 1 ) 2 = PC 2 + AC 2 + AS 1 2 - 2ACAS 1 Since AS 1 =AS 2 = a/2 so PS 2 2 – PS 1 2 = 4ACAS 1 Using (x 2 –y 2 ) = (x-y) (x+y) (PS 2 – PS 1 ) (PS 2 +PS 1 ) =4 AC AS 1 Ear destructive interference at P PS2 – PS1 = (N- ½)λ Also since L >> a, PS 2 approximately PS 1 approximately L (N- 1/2)λ 2L = 4 x a/2 Destructive (n-1/2)λ = ax/L Constructive nλ =ax/L
Apparatus: Procedure: 1. Turn on the red laser and observe the intensity of the wave interference pattern on the screen. 2.

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Lab III - Lab III Light A Wave or Particle Purpose The...

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