Discussion
Assertion (A): Illuminant D65 is not exactly 6500 kelvin.
Reason (R): A later revision to the second radiation constant shifted the value slightly.
Answer: B
Both are true and the reason gives the history, and the name was retained for continuity. The same applies to D50 and D75 in the same series. A constant revision shifted all three slightly. Names were retained for continuity of usage.
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