0-9 | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z
The mathematical statement that the radiance of certain idealized optical sources is directly proportional to the cosine of the angle--with respect to the direction of maximum radiance--from which the source is viewed. Note: Lambert's cosine law may also apply to certain idealized diffuse reflectors. Synonyms cosine emission law, Lambert's emission law.