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In an interference pattern the `(n+4)^(th)` blue bright fringe and `n^(th)` red bright fringe are formed at the same spot. If red and blue light have the wavelength of `7800Å` and `5200 Å` then value of n should be-A. 2B. 4C. 6D. 8 |
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Answer» Correct Answer - D `D/d (n+4 ) lambda_(B)=D/d n lambda_(R)` `(n+4) 5200 = n 7800 ` n=8 |
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