Answer:
Thickness = 123.19 nm
Explanation:
Given that:
The refractive index of the glass = 1.50
The refractive index of thin layer of magnesium fluoride = 1.38
The wavelength of the light = 680 nm
The thickness can be calculated by using the formula shown below as:
[tex]Thickness=\frac {\lambda}{4\times n}[/tex]
Where, n is the refractive index of thin layer of magnesium fluoride = 1.38
[tex]{\lambda}[/tex] is the wavelength
So, thickness is:
[tex]Thickness=\frac {680\ nm}{4\times 1.38}[/tex]
Thickness = 123.19 nm