Lightness constancy

The spectral characteristics of the source, photocells, and the three filters are such that approximate I.C.I. tristimulus values may be calculated (5) and from these a specification in terms of luminous reflectance, dominant wave length, and purity can be obtained. Hardy has cautioned (3), however, that the usefulness of such an instrument as a tristimulus colorimeter depends upon the standardization and constancy of the spectral characteristics of the light source, cell, and filters. 

The problem relates directly to the constancy of c, which implies that the velocity of light is independent of both the motion of its source and the direction of propagation, a condition that cannot hold in more than one Newtonian inertial frame if the Galilean principle of relativity applies. Since there is no evidence that the laws of physics are not identical in all inertial frames of reference the only conclusion is that the prescription for Galilean transformations needs modification to be consistent, not only with simple mechanics, but also with electromagnetic effects. 

In a new graphical way, we have solved optical problems found in the literature regarding special relativity. To arrive at these results, we used the accepted concept of the constancy of the speed of light and the following tools a string and two nails for making ellipses and a ruler, pen, and paper to draw the diagrams. 

The constancy of velocity of light attracted the whole scientific community since the publication of the paper on special theory of relativity by Albert... 

It is clear from the above mentined astrophysical data that it raises new opportunity to test the validity of assertion of constancy of velocity of light. 

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