Because there's only green light illuminating it. If the rose is looking for any
other color besides green, it might as well be night. There's no source of red
light to bounce off of the rose to your eyes, and the rose absorbs other colors.
The red rose appears black when green light shines on it because the green light is mainly absorbed by the red pigments in the petals. Since the green light is not being reflected or transmitted, the petals appear black to our eyes.
The yellow shirt would appear black because yellow absorbs green light, rather than reflecting it.
The green paper will absorb most of the red light and reflect or transmit very little of it. This is because the green pigment in the paper absorbs red light and reflects green light. Therefore, the red light will not be well reflected from the green paper, making it appear dark or black.
While the ball would still be green it will appear black. Anything green absorbed all colours except green. The green light is reflected to your eyes which makes it look green. Thus in red light (with no green in it) the red will be absorbed and no green light can be reflected to your eyes so the ball will look black.
The green apple absorbs most colors of light but reflects green light. When white light shines on the apple, its surface absorbs all colors except green, which gets reflected back to our eyes, making the apple appear green.
The green object will appear black because it will not reflect any of the blue light shone on it. Green objects primarily absorb blue light, so without any green or red light present, the object will appear dark.
A lemon would appear green under green light because the object reflects the color of light that it does not absorb. In this case, a lemon's yellow color would absorb all other colors except green, which it would reflect.
The yellow shirt would appear black because yellow absorbs green light, rather than reflecting it.
The green paper will absorb most of the red light and reflect or transmit very little of it. This is because the green pigment in the paper absorbs red light and reflects green light. Therefore, the red light will not be well reflected from the green paper, making it appear dark or black.
To make green appear black, shine red light on it. Green absorbs red light, so when red light is shone on green, the green will appear black.
While the ball would still be green it will appear black. Anything green absorbed all colours except green. The green light is reflected to your eyes which makes it look green. Thus in red light (with no green in it) the red will be absorbed and no green light can be reflected to your eyes so the ball will look black.
The green apple absorbs most colors of light but reflects green light. When white light shines on the apple, its surface absorbs all colors except green, which gets reflected back to our eyes, making the apple appear green.
green,red
The cap is called 'green' because it absorbs all other colors of light, leaving only the green light to bounce from it to your eyes. If no green light shines on it, then there's no light to bounce from it to your eyes, and it appears black. If you only shine blue light on it, then there's no green light shining on it.
The green object will appear black because it will not reflect any of the blue light shone on it. Green objects primarily absorb blue light, so without any green or red light present, the object will appear dark.
Green trousers would appear black when exposed to red light because the red light does not contain any green wavelengths to reflect off the trousers. Without any green light to reflect, the trousers will appear black in the presence of red light.
Green would appear black or very dark under magenta light because magenta light contains no green wavelengths to reflect back. Therefore, without green light to reflect, green objects would not be visible and would appear dark or black.
In green light, a red book would appear black. Green light does not contain any red wavelengths to reflect off the red book, so it would absorb most of the green light and appear black instead.