Partially polarized light can be considered as a superposition of unpolarized light and polarized light. The degree of blindness (B) is defined as the fraction of the total irradiance input (I) over the sum of input and output (O) irradiance: B=I/(I+O). If I=0 then B=0 and everything is crystal clear as a state of perfect consciousness. However, if O=1 then B is a rational function whose graph shows a 3 parts domain of rationality. (1) If the domain I is [0, ∞) then the range B is [0, 1) and the blindness increases and asymptotically approaches very slowly toward unity. (2) If the domain is [0, -1) then the range is [0, -∞). This demonstrates the existence of negative degree of blindness which increases rapidly as the retarded irradiance asymptotically approaches negative unity. (3) If the domain is (-1, -∞) then the range is (1, ∞). This indicates irreparable blindness including total loss of memory and consciousness.


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