Its a process called chemosynthesis I think.
Bioluminescence
sunlight doesnt penetrate that deep.
Red light does not penetrate more than gamma rays.
coz it cant
YES
yes it is light and light can
if wavelength of light is of order of radii of earth then why it will penetrate deeper in sea?
they are absorbed
The upper 100 -200 m of the ocean is called the Photic zone (photo = light).At about 150 meters 99% of light is absorbed.Beyond the Photic zone, light does not penetrate, and it is pitch dark.
There is no "usable" light agter 200 meters...
UV light doesn't fully penetrate it. At deepest, it only penetrates less than a millimeter and still doesn't make it past the top layer of skin.
Usually no- they are far too deep underwater for light to penetrate.