Lambert’s Law

Lambert Law:

The rate of decrease of the intensity of light with decrease of thickness of medium is directly proportional to the intensity of transferred light.

When a monochromic light of definite wavelength is passed through a solution, the decreasing rate of intensity of the incident light When a monochromic light of definite wavelength is passed through a solution, the decreasing rate of intensity of the incident light ( ) with thickness of the cell is directly proportional to its intensity.

with thickness of the cell is directly proportional to its intensity.

( ) with thickness of the cell is directly proportional to its intensity.

If a light with a specific wavelength transfers through a transparent medium, the intensity of light is proportional to the rate of intensity decreased with thickness of medium.  

Let us consider, the intensity of light transferred  through a transparent medium be ‘I’ and the thickness of medium be ‘l’, then, according to Lambert’s Law we can write