When the angle of refraction is 20°, what is the angle of incidence?

Porque crees que el agua no podia subir mas de 10 m de altura con ese tipo de bomba

The consumption of fossil fuels could be

With the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 1.90