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if wavelenght of light use in michelsons inferometre is 400 nm a diametre of 0.05mm and 500 fringes are observed.. then the wavelenght of light used is a.1*10^-7m b.1*10^-8m c. 2*10^-7m d. 1.5*10^-7m correct ans is option b.. but i wanna compelete solution....

if wavelenght of light use in michelsons inferometre is 400 nm a diametre of 0.05mm and 500 fringes are observed.. then the wavelenght of light used is 
 
a.1*10^-7m
b.1*10^-8m
c. 2*10^-7m
d. 1.5*10^-7m
correct ans is option b.. but i wanna compelete solution....

Grade:12th pass

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