1.

A disc painted with different colours is showna. Which colour is X if the disc appears white on rotating fast? b. Why did the disc appear white on being rotated fast? c. In what colour will the disc appear if green light alone is made to fall on the disc when it is being rotated fast?

Answer»

a. Cyan 

b. Due to persistence of vision 

c. In green colour On rotating the disc faster, the disc appears white due to persistence of vision. The cyan appears as green since it reflects green light.



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