Discussion
Assertion (A): A map intended for photocopying in black and white should encode its categories with texture rather than hue.
Reason (R): Different hues of similar lightness become indistinguishable when reduced to grey.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason is the cause. Photocopying discards hue and keeps only lightness, so a red and a green of similar value collapse to the same grey and the categories become indistinguishable. Texture, pattern and hatching survive the reduction because they differ in structure rather than in colour - and the same reasoning underlies designing for colour vision deficiency.
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