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a soap bubble appears green at the point on its front surface nearest the viewer. what is the smallest thichness of the sapbubble film could have? N=1.35
according to interfernce:if soap bubble appears green then green light should have maxima at that pointand as the light is returning to the viewer so it attains additional path difference of 180degreeso the condition becomes:
dX=(2n-1)L/2 INSTEAD OF dX=(n)L where L=wavelenght of green light
and dX= 2ut where u=refractive index of soap and t=thickness of soap film
so,2ut=(2n-1)L/2
as we have to find minimum distance so,
t=L/4u keeping n=1
keep u=1.35 L=WAVELENGTH OF GREEN LIGHT
HOPE IT IS CORRECT
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