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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
- IIT JAM
- Geology (GG)
23. maximum intensity of interterence colours occurs when the value or retardaion is equal to (a) (b) (2n+ 1) (c) an (d) zero
23. Maximum intensIty of interterence colours OCcurs when the value or retardaion is equal to (A) (B) (2n+ 1) (C) an (D) zero
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Saurabh 1
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This is purely based on optics(physics concept) . As you have already read these things in class 12 th optics chapter, I will keep it simple. When two waves are travelling in a medium and they interfere in-phase Or they are in phase, then constructive interference occurs and we get resultant wave. If the path difference (or retardation, actually retardation is synonym of path of difference in the fact they are basically calculated for E and O ray in case of optical mineralogy and depends on the relative difference between refractive index ) is an integral number of wavelengths, nλ, the waves are in phase. But for completely out of phase system, the path difference (retardation) will be equal to 1/2λ , 3/2λ, 5/2λ, etc. or [(2n+1)/2]λ. For path differences where the waves are completely out of phase, complete destructive interference will occur and no wave will emerge from the polarizer. So as per options given, option (A) will corresponds to maximum intensity of interference colors while, option (C) corresponds to minimum intensity. So correct option would be (A).
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Saurabh 1 Best Answer
yes they are correct but we don't really use them. Actually we use A as the basic or general formula for max intensity even in case of optical physics.
thanks sir