the surface of a material of refractive index 1.8 is coated with a thin film of liquid of refractive index 1.5 and thickness 200nm. White light falls normally on the thin film.
Which of the following ight wavelengths in air is not reflected from the thin film/
the surface of a material of refractive index 1.8 is coated with a thin film of liquid of refractive index 1.5 and thickness 200nm. White light falls normally on the thin film.
Which of the following ight wavelengths in air is not reflected from the thin film/
a.400nm
b.450nm
c.600nm
d.750nm
e.800nm[/QUOTE]
2t = (n + 1/2) [wavelength]/[refrective index of film]
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