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

Answer:

152.31 nm

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