Light reflected from the surface of a compact disc is multicolored. The colors and their intensities
depend on the orientation of the disc relative to
the eye and relative to the light source. why??!!
The surface of a compact disc has a spiral
grooved track. Thus, the surface acts as a reflection grating.
The light reflecting from the regions between these
closely spaced grooves interferes constructively only in certain
directions that depend on the wavelength and on the direction
of the incident light. Any one section of the disc
serves as a diffraction grating for white light, sending different
colors in different directions. The different colors we
see when viewing one section change as the light source, the
disc, or we move to change the angles of incidence or diffraction. Thats all abt WAVE OPTICS
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