81.
Assertion (A): Dominant wavelength must be quoted with the white point assumed.
Reason (R): The construction begins at the white point and its position determines the result.
Answer: A
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. The construction line starts at the white point, so moving the white point swings the line and moves where it meets the locus. The same sample therefore has different dominant wavelengths under different illuminants, and the figure is meaningless without the white point being stated.
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