Question

Visible light is incident on an oil film (n= 1.51) coating a puddle of water. ​For what minimum oil thickness will you see no reflection for the blue light (460 nm )?​

Answer 1

152.31 nm

Step-by-step explanation:

`n` = index of refraction of oil coating = 1.51

`\lambda` = wavelength of blue light = 460 nm

`m` = order = 1

`t` = minimum thickness of the coating

Using the equation

`2 n t = m\lambda`

Inserting the values

`2 (1.51) t = (1) (460)`

`t = 152.31` nm