The minimum thickness of the oil slick at that spot is 313 nm.
The refractive index of the oil is 1.3,
Therefore, the interface between the two rays will give two stage change or zero stage change.
The position for the constructive interface :
[tex]2 n t=m \lambda[/tex]
Where, n = refractive index of oil
m = order
So, for the minimum thickness (i.e. m = 1)
[tex]t_{\min }=\frac{\lambda}{2 n}[/tex]
[tex]t_{\min }=\frac{750}{2 \times 1.2}[/tex]
[tex]t_{\min }=313 \mathrm{~nm}[/tex]
What is The refractive index?
A primal physical property of a substance, it is usually used to identify a particular substance, confirm its chastity, or scale its concentration is called refractive index.
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