Water reflects because of scattering and reflection principles. Water only reflects in the visible light range of the spectrum. When the sun shines shortwave radiation rays into the water at different angles, it is either reflected or absorbed and refracted in the water. Some lakes reflect better, because of their spatial orientation. Sunlight shining almost parallel to the surface of the water almost fully reflects back out. The color of the water also plays a big role. For example, ice has the highest albedo(reflectance) while ocean water acts like a black body and absorbs all incoming light when shone directly overhead. Lakes reflect better, at certain time during the day and year, because of the angle of incoming solar light as well as the location of the lake coupled with wind action on ripples.
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