Discussion
Assertion (A): A room lit by tungsten stops looking yellow after a short time.
Reason (R): Chromatic adaptation rescales the cone responses to the prevailing illumination.
Answer: B
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. Tungsten light is markedly yellower than daylight, and on first entering the room the difference is obvious; within a minute or two the cone responses have been rescaled and the room looks normal. The adaptation is in the observer, which is why a camera, having none, records the yellow that was there all along.
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