Why colour of badminton court is green or blue?
Badminton courts can be green or blue but they are usually green
In simple terms, the shuttlecock's colour indicates suitablity for the badminton court's temperature. The colours or rather the colour band towards the bottom of the shuttlecock is indicative of the ambient or optimum temperature of the badminton court which determines preference or selection of a particular coloured shuttlecock. This determines the shuttlecock's performance In relative terms, Red = Fast; Blue is Medium; Green = Slow. Often times, i simply go for the blue banded birdies…
The three primary colours, red, yellow and blue, each have a complimentary colour. The complimentary colour of red is green, that of yellow is purple and that of blue is orange. You may note that each complimentary colour is a mix of the other two primary colours. E.g. Complimentary colour of red is green, because green is a mix of blue an yellow, etc.
It depends on the colour of incident light. If incident light is red, then red reflects more than green and blue. Likely green reflects more when incident light is green and blue reflects more when incident light is blue. If incident light is yellow then green and red reflects nearly same for pure yellow and blue will not reflect the light in that case. The colour of incident light determine the reflectance.