The field of physical optics studies not the particle nature but this nature of light
[DOC] [TLE] Optics | Article about optics by The Free Dictionary [PAR] Physical optics is concerned with the genesis, nature, and properties of light; ... 
the branch of physics that studies the nature of optical radiation, or light, and ... in 
terms of geometrical optics but does not disregard the wave nature of the 
radiation.