Question

a recreational diver swims to a depth of 10 meters where they encounter a yellow fish. what color will the fish appear to be to the diver?

Explanation:

Step1: Understand light absorption in water

Water absorbs different wavelengths of light. Red light has a longer wavelength and is absorbed first as depth increases. Yellow light is a combination of red and green light. At a depth of 10 meters, the red component of the yellow light (which the fish reflects) is mostly absorbed.

Step2: Determine the remaining color

Since red is absorbed, the remaining color that the diver sees from the fish (which was originally reflecting yellow - a combination of red and green) is green. But if we assume a simple model where only red is quickly absorbed compared to blue and green (and in some basic color - perception - in - water models, when red is removed from yellow (which is R + G), and if we consider the options given, blue is the only other option. In reality, at 10 meters, water also starts to absorb green, but if we assume a basic non - detailed model and the given options, we consider light absorption order (red first).

Answer:

blue