A block of lanthanum flint glass is covered by a thick layer of water. A narrow beam

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A block of lanthanum flint glass is covered by a thick layer of water. A narrow beam of light in the water arrives at the waterglass interface at an angle of 40.0° with respect to the normal. At what angle measured from the normal does the beam progress into the glass?
TABLE 37-1 Approximate Indices of Refraction of Various Substances* Air Ice Water Ethyl alcohol (CH,OH) Fused

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