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AP Physics 2
13.3 Refraction
AdvancedMCQMathematical17.8k
Light ray entering a submerged prism at normal incidence.
Light ray entering a submerged prism at normal incidence.
A transparent triangular prism with an apex angle \(\alpha\) is submerged in a fluid of refractive index \(n_{\text{fluid}}\). A ray of monochromatic light traveling in the fluid strikes the vertical leg of the prism at normal incidence and travels to the hypotenuse face, as shown. The speed of light in a vacuum is \(c\). Which of the following expressions represents the maximum speed of light inside the prism, \(v_{\text{prism}}\), for which total internal reflection will still occur at the hypotenuse face?

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