Discussion
Assertion (A): Absorbance rather than transmittance is the additive quantity in a transparent mixture.
Reason (R): Transmittances multiply, and the logarithm of a product is the sum of the logarithms.
Answer: B
Both are true and the reason gives the mathematics, and this is why absorbance is used. It converts a multiplicative problem into an additive one. Logarithms turn products into sums. Absorbance is the additive quantity.
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