They will look red.
This is because red boots only reflect red light. If white light was shining on them then they would still appear red because the red light would be reflected into your eyes and the other colours from the spectrum would be absorbed. However, if, for example blue light was shining on them, they would look dark/black because there is no red light to reflect.
Red.
brown
It would appear to be red because it can only reflect the red light.
If the light is or contains the colour the object it is striking, then the object will appear to be the colour it originally is. If the light is not or does not contain the colour the object it is striking, then object will appear black. This is because an object will only reflect the light that is the same colour as it, all other light is absorbed. For example: Red, yellow, magenta, and white light will make a red object appear red as they all contain red light. Blue, green and cyan light will make a red object appear black.
The object would be black, because red cannot reflect green light so no colour is reflected of the object.
Red.
brown
It would appear to be red because it can only reflect the red light.
It looks red.
black
yellow, because green+red makes yellow in the addition of light!
black and red predators
If the light is or contains the colour the object it is striking, then the object will appear to be the colour it originally is. If the light is not or does not contain the colour the object it is striking, then object will appear black. This is because an object will only reflect the light that is the same colour as it, all other light is absorbed. For example: Red, yellow, magenta, and white light will make a red object appear red as they all contain red light. Blue, green and cyan light will make a red object appear black.
The object would be black, because red cannot reflect green light so no colour is reflected of the object.
Red is a primary colour for light.
The white object will look red because the white surface reflects all colors and since only a red light is used it will only reflect red.
Red light shining on an object that reflects primarily red light will be red