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Derive the expression for the intensity at a point where interference of light occurs. Arrive at the conditions for maximum and zero intensity?

Derive the expression for the intensity at a point where interference of light occurs. Arrive at the conditions for maximum and zero intensity?

Grade:12

1 Answers

Vikas TU
14149 Points
5 years ago
Its simple!
Just think of two waves having Electric fields as:
E1 = E0sinwt and E2 = E0sin(wt + o)
where o is phase sshift of o.
The resulatant electric field would be E1 + E2.
Use sinc + sind formulaes and u would obtain as:
Enet = 2E0coso/2 * sin(wt + o/2)
.
Now u need to know taht:
Intensity is always directly proprtion to square of electric field or amplitude.
THus,
I = Imaz * cos^2(o/2).

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