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Show that λ=7.228×105cm will be strengthened in the reflected light.

Subject: Applied Physics 2

Topic: Interference And Diffraction

Difficulty: Medium


A light beam is incident at an angle of 400 with normal on a plane parallel film of thickness 4×105 cm & RI 1.5. Show that λ=7.228×105cm will be strengthened in the reflected light.

1 Answer
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t=4 × 105 cm , i=40˚, μ = 1.5

μ= sin isin r

sinr = sin iμ

sin r = 0.42

Therefore r= 25.37

cos r = 0.9035

For constructive interference in reflected light 2μ t cos r = (2n±1) λ2

2μ t cos r = m λ2 , …

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