What colour would a bunch of green grapes be in red light?

A bunch of green grapes in red light would appear black or very dark. Here's why:

* Light Absorption: Green grapes absorb most wavelengths of light except for green, which they reflect.

* Red Light: Red light has a longer wavelength than green light.

* No Reflection: Green grapes don't reflect red light, meaning they absorb it. Since no light is reflected back to your eyes, they would appear dark.