# 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