A parallel beam of sodium light strikes a film of oil floating water. When viewed at an angle of 300 from the normal the 8th dark band is seen. IF R.I. of oli is 1.46, find thickness of film
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The thickness of the oil film on water is is
Explanation:
Given the order of dark fringe,
Refractive index of oil,
Wavelength of sodium light,
and assuming the angle of reflection is,
In thin film interference, the condition for minimum intensity is given by
substituting the values in the above formula
Therefore, the thickness is,
Therefore, the thickness of the oil film on water is .
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