The colour of an opaque object is the colour which it reflects when white light is fallen on it. The object absorbs all the different colours and will reflect only its true colour.
So, to find the true colour of the object we use white light because it consists all the colours.
According to this when white light is fallen on a white object it will reflect all the light which show that white object reflects all the colour and don't absorb anything because white light is consisted of all the colour.
So, when red light is allowed to fall on a white object it will reflect all the red light and will appear as a red object because white objects reflect all the colour.
Hence from this we can say that when red and green lights are allowed on a white ball the ball will appear red and green respectively.
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