Hello,(adsbygoogle = window.adsbygoogle || []).push({});

I have a quick question relating to Lambert's cosine law for diffuse reflection. My understanding of the law is that given an isotropically illuminated surface, the reflection distribution goes with the cosine of the zenith angle.

Now my question is whether or not that law holds for a single ray. That is, suppose a ray hits a surface at an arbitrary incident angle. Is the probability distribution for the direction of reflection lambert's law as well? Or does the law only hold on average for a large number of incident rays in random directions?

Thanks!

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Lambert's Cosine Law

**Physics Forums | Science Articles, Homework Help, Discussion**