Its a process called chemosynthesis I think.
The photic zone is the region of an aquatic environment where light can penetrate sufficiently for photosynthesis to occur. It typically extends to a depth of around 200 meters in clear oceanic waters, but can vary depending on water clarity and other factors.
Bioluminescence
sunlight doesnt penetrate that deep.
Red light does not penetrate more than gamma rays.
coz it cant
YES
if wavelength of light is of order of radii of earth then why it will penetrate deeper in sea?
they are absorbed
The depth light can penetrate underwater depends on water clarity and the angle of the sun. In clear ocean water, sunlight can penetrate up to 200 meters (656 feet). In murky or turbid water, light penetration may only be a few meters.
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.
Yes, UV light can penetrate through clouds, although the amount that reaches the Earth's surface is reduced compared to a clear sky.
The wavelengths of light that penetrate deepest into the ocean are blue and green light. These colors can travel the farthest through water because they are absorbed less by water molecules and particles.