A narrow beam of light is traveling within a large block of sodium chloride (NaCl) that is immersed in air. The beam strikes the flat crystal-air interface making an angle of 25.0° At what angle does the beam emerge into the surrounding air?

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TABLE 37-1 Approximate Indices of Refraction of Various Substances* Air Ice Water Ethyl alcohol (C₂H-OH) Fused quartz (SiO₂) Carbon tetrachloride (CCL4) Turpentine Benzene (C6H6) Plexiglass Crown glass Sodium chloride (NaCl) Light flint glass Polystyrene Carbon disulfide (CS₂) Dense flint glass Lanthanum flint glass Zircon (ZrO₂ SiO₂) Fabulite (SrTiO3) Diamond (C) . Rutile (TiO₂) Gallium phosphide 1.000 29 1.31 1.333 1.36 1.4584 1.46 1.472 1.501 1.51 1.52 1.544 1.58 1.59 1.628 1.66 1.80 1.923 2.409 2.417 2.907 3.50 *Values vary with physical conditions-purify, pressure, etc. These correspond to a wavelength of 589 nm.