As light from the surface penetrates water, its intensity is diminished. In the clear waters of the Caribbean, the intensity is decreased by 15 percent for every 3 meters of depth. Thus, the intensity will have the form of a general exponential function. a. If the intensity of light at the water's surface is . find a formula for I(d), the intensity of light at a depth of d meters. Your formula should depend on To and d. b. At what depth will the light intensity be decreased to 1% of its surface intensity