Question

Example 22.2 Angle of Refraction for Glass Goal Apply Snell's law to a slab of glass. Incident Normal rav Problem A light ray of wavelength 589 nm (produced by a sodium lamp) traveling through air is incident on smooth, flat slab of crown glass at an angle of θ1-35° to the normal, as sketched in Figure 22.11. Find the angle of refraction, θ2. Strategy Substitute quantities into Snell's law and solve for the unknown angle of refraction, θ2. iI Glass Refracted ray Figure 22.11 Refraction of light by glass. Solution Solve Snell's law (Eq. 22.8) for sin e2 1.00 From Table 22.1, find n1 1.00 for air and n2 -1.52 for crown glass. Substitute these values into (1) and take the inverse sine of both sides. sin35.00.377 02 - sin-1(0.377) 22 Remarks Notice the light ray bends toward the normal when it enters a material of a higher index of refraction. If the ray left the material following the same path in reverse, it would bend away from the normal.

Answer 1

芍之 ry -52 Oin 61 shil Ir, 52.xsin 3S" 60. 673