Question

A research ship in the Pacific Ocean is testing a new method of detecting pollutants in ocean water (n_water=1.3330). Their experimental apparatus includes two lasers which hang over the side of the ship and point downward into the water (the lasers themselves are suspended in the air above the surface of the ocean). One laser is violet (λ=400 nm, α_H2O = 0.0044 m^-1) and the other is red (λ=700 nm, α_H2O = 0.6 m^-1). Both lasers are very bright, with an intensity of 4650 W/m².

(a.) What is the fraction of light coming from the red laser beam that is transmitted from the air into the water?

(b.) What is the intensity of the blue laser beam at a depth of 4 m?

(c.) What is the intensity of the red laser beam at a depth of 4 m?

Answer 1