Answer
See the detailed answer below.
Work Step by Step
We know that the red color is red because it absorbs all other color lights except the red, it reflects it.
So when we illuminate the red card with red light, it will reflect that light to your eyes so you will see it as a red card.
But if we illuminated it with blue light, it will absorb it and then no light will be reflected from it. So you will see it as a black card.
