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AP Physics 2
13.3 Refraction
AdvancedMCQMathematicalConceptual22.3k
A right-triangular glass prism with a vertical left face, a horizontal bottom base, and a slanted hypotenuse face sloping down to the right. The top apex angle between the vertical face and the hypotenuse is labeled theta equals 45 degrees. The prism has index of refraction n_glass = 1.50. A thin uniform layer of liquid with n_liquid = 1.20 coats the slanted hypotenuse face. A horizontal light ray entering from the left strikes the vertical face at normal incidence, passes straight through, and hits the hypotenuse face. A dashed line perpendicular to the hypotenuse indicates the normal at the point of incidence. Outside the liquid layer is air with n_air = 1.00. No other labels, lines, text, or axes appear.
Light ray traversing a liquid-coated glass prism.
A monochromatic light ray traveling horizontally in air (\(n_{\text{air}} = 1.00\)) strikes the vertical face of a right-triangular glass prism (\(n_{\text{glass}} = 1.50\)) at normal incidence. The apex angle at the top of the prism is \(\theta = 45^\circ\). The slanted hypotenuse face of the prism is coated with a uniform thin layer of transparent liquid (\(n_{\text{liquid}} = 1.20\)), which is exposed to air on its outer surface. Which of the following correctly claims whether total internal reflection (TIR) occurs as the light ray reaches these interfaces, and provides the correct physical reasoning?

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