Two identical light waves having phase difference ϕ propagate in the same direction. When they superpose, the intensity of the resultant wave is proportional to

Question

Two identical light waves having phase difference ϕ propagate in the same direction. When they superpose, the intensity of the resultant wave is proportional to, cos 2 ⁡ ϕ, cos 2 ⁡ ϕ 2, cos 2 ⁡ ϕ 3, cos 2 ⁡ ϕ 4

MARKS App · Accepted Answer

For two identical light waves I R = 4 I cos 2 ⁡ ϕ 2 ∴ I R ∝ cos 2 ⁡ ϕ 2

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