Search
Menu
DataRay Inc. - ISO 11146-Compliant Laser Beam Profilers
Photonics Dictionary

cosine fourth law

A formula indicating that, for an imaging lens system, the image brightness for off-axis points will fall off at a rate proportional to the cos4 of the off-axis field angle.
We use cookies to improve user experience and analyze our website traffic as stated in our Privacy Policy. By using this website, you agree to the use of cookies unless you have disabled them.