Question

The blue color of the water of the sea is due to:
A. Reflection of the blue light by salts present in the water
B. Scattering of blue light by sol particles
C. Refraction of blue light by impurities present in seawater
D. Absorption of radiation of different colors except the blue light

Answer 1

Hint: light spectrum consists of seven different colors that are violet, indigo, blue, green, and yellow, orange, red. When a material absorbs one color, then that material will reflect the complementary color of that color from the visible spectrum.

Complete Step by step answer: The color of the sea is blue because water absorbs colors in the red part of the light spectrum.
The visible light that we get from the sun consists of seven colors. Out of which the water molecule present in the sea absorbs Red, Orange, Yellow and Green wavelengths of the light. This part of the spectrum is known as the red part of the spectrum.
Now, the only wavelengths that are left are blue wavelengths. These wavelengths are scattered by the water molecules present in the sea. And when these blue wavelengths fall on our eyes, the sea appears to be blue. As we go deeper in the sea, the rate of absorption of the red part of the spectrum of the light increases, so we only can see blue when we go deep down under the sea.

So, the correct option is D.

Note: This effect works only if the water is clear. The Sea may also look green (because of green algae), red or other as light bounces off of floating substances and particles in the water. As we go deeper in the water, it may seem completely dark.