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AP Physics 2
13.3 Refraction
BeginnerMCQConceptual15.4k
A horizontal line represents the flat boundary between two media, with medium 1 (glass, n = 1.50) below the boundary and medium 2 (air, n = 1.00) above the boundary. A dashed vertical line represents the normal line passing perpendicularly through the center of the boundary. Three incident rays, labeled Ray 1, Ray 2, and Ray 3, originate in medium 1 below and travel upward-right to meet at the exact point where the normal line intersects the boundary. Ray 1 makes an angle of 30 degrees with the normal line. Ray 2 makes an angle of 42 degrees with the normal line. Ray 3 makes an angle of 55 degrees with the normal line. Angles are labeled between each ray and the normal line. No reflected or refracted rays are shown in either medium. No other labels, lines, text, or axes appear.
Light rays approaching a glass-air boundary.
A beam of light traveling inside a glass block of index of refraction \(n = 1.50\) approaches a boundary with air of index of refraction \(n = 1.00\). The critical angle for total internal reflection at this boundary is \(\theta_c = 42^\circ\). As shown in the diagram, three light rays (Ray 1, Ray 2, and Ray 3) strike the boundary at incident angles relative to the normal of \(30^\circ\), \(42^\circ\), and \(55^\circ\), respectively. Which ray undergoes total internal reflection, and why?

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