A narrow monochromatic beam of light of intensity Ι is incident on a glass plate as shown in figure. Another identical glass plate is kept close to the first one & parallel to it. Each glass plate reflects 25 % of the light incident on it & transmits the remaining. The ratio of the minimum & the maximum intensities in the interference pattern formed by the two beams obtained after one reflection at each plate is 1:n find value of n.
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Sol. The shown diagram represents the reflection and refraction intensity.
Hence the 2 waves interfering, 1 and 2, have intensities 
and 
.
⇒ 
= 
= 
= 
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