Discussion
Assertion (A): A tungsten lamp scores one hundred on the colour rendering index.
Reason (R): It is compared against a blackbody reference that it very closely resembles.
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. Below 5000 K the colour rendering index compares the source with a blackbody at the same correlated colour temperature, and a tungsten lamp very nearly is one. It therefore scores about 100 by construction - a fact that shows how the index should be read: as fidelity to a reference, not as a measure of light quality in the abstract.
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