Discussion
Assertion (A): Standard Kubelka Munk theory cannot handle fluorescent colourants.
Reason (R): It describes absorption and scattering but contains no emission term.
Answer: D
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. Kubelka Munk accounts for light absorbed and light scattered, and a fluorescent colourant does something neither describes: it absorbs at one wavelength and re-emits at a longer one, so more light can leave at that wavelength than arrived. Handling fluorescence requires a bispectral treatment relating excitation to emission.
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