Suppose a light ray traveling in air passes sideways through a glass of water and comes out the other side. how many times will the light ray refract?
a. one time; through the water b. four times; through glass, water, glass, and air c. three times; through glass, water, and glass again d. two times; through the glass and the water

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

The movement of electrons between atoms is called an

What equation is used to calculate the weight of an object on a plant ?