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AP Physics 2
13.3 Refraction
IntermediateMCQMathematicalConceptual22.8k
A two-region horizontal cross section showing a flat interface separating two media. The lower region is filled with glass and labeled with text glass, \(n_{\text{glass}} = 1.50\). The upper region is filled with liquid and labeled with text liquid, \(n_{\text{liquid}} = 1.20\). A vertical dashed line perpendicular to the interface represents the normal line. In the lower glass region, a single straight solid line with a central arrowhead starts from the lower-left and travels toward the upper-right, terminating at the intersection of the interface and the normal line. An angle arc is drawn in the lower region between the vertical dashed normal line and the incoming ray line, labeled with the symbol \(\theta_i\). No outgoing rays, reflected lines, or refracted lines are drawn above or below the interface. No other labels, lines, text, or axes appear.
Light ray in glass incident on a glass-liquid boundary.
A light ray traveling inside a glass block with index of refraction \(n_{\text{glass}} = 1.50\) strikes a flat boundary with an adjacent liquid of index of refraction \(n_{\text{liquid}} = 1.20\). Which of the following correctly identifies the sine of the critical angle, \(\sin\theta_c\), for total internal reflection at this boundary, and describes the path of the light ray when its angle of incidence in the glass satisfies \(\theta_i > \theta_c\)?

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