1.

Two light sources have intensity of light as Io . What is the resultant intensity at a point where the two light waves have a phase difference of π/3?

Answer»

Let the intensities be Io 

The resultant intensity is, I = 4Io  cos2 (φ/2) 

Resultant intensity when, ϕ = π/ 3, is I = 4Io cos2 (π / 6) I 

= 4Io (√3 / 2)2 =3Io



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