# Reflection dependence from wavelenght

prehisto

## Homework Statement

Hi guys, I have this exercise and I m confused.
Incident (white light) light ray is perpendicular to glass surface , glass plate is 0,4microm thick. Which wavelengths in reflected ray becomes more intense?

## The Attempt at a Solution

So i know that light is refracted on the surface of 2 different mediums, different wavelengths are refracted in different angles.
But i do not know nothing about wavelength and/or intensity dependence from reflection. And its seems weird that intensity of some wavelengths increases after reflection.

Maybe some tips about which physical phenomenon I should study?

Homework Helper

## Homework Statement

Hi guys, I have this exercise and I m confused.
Incident (white light) light ray is perpendicular to glass surface , glass plate is 0,4microm thick. Which wavelengths in reflected ray becomes more intense?

## The Attempt at a Solution

So i know that light is refracted on the surface of 2 different mediums, different wavelengths are refracted in different angles.
But i do not know nothing about wavelength and/or intensity dependence from reflection. And its seems weird that intensity of some wavelengths increases after reflection.

Maybe some tips about which physical phenomenon I should study?
Think of interference. For which wavelength is constructive interference in the reflected light?

prehisto
prehisto
Think of interference. For which wavelength is constructive interference in the reflected light?

Ok, I think I go it.
First I calculate the angle of light ray inside the glass from Snell's law.
Second I use Thin films equation for constructive interference and calculate the wavelengths by altering m in the formula.
Correct?

Homework Helper