Discussion
The colour of an object is largely determined by its diffuse reflection coefficient. If \(K_{d}\) = (0.8, 0.4, 0), then what shall be the colour of the object, if the light used is blue and magenta ?
Answer: D
The diffuse reflection coefficient (0.8, 0.4, 0) gives the fraction of red, green and blue light the object reflects, so it reflects no blue at all. Under blue light the object receives only blue, and reflects none of it, so it looks black. Magenta light is red plus blue; the object reflects 0.8 of the red and none of the blue, so it looks red. So the colours are black and red, option (D). Options with white or blue would need the object to reflect blue light.
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