wave theory phys རླབས་ཀྱི་རྣམ་གཞག = འོད་དང་གློག་ཁབ་ལེན་གྱི་འགྱེད་འཕྲོ་གཞན་
The mathematical theory of the influence of thin films on the reflection and transmission of light
Light, Action, Illumination: These three words can be used to describe the general topics in the given texts