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3) A light ray travels in a medium with refractive index n1 and is completely reflected at the boundary with a second medium of refractive index n2. n1 n2 The figure shows a horizontal boundary between two media. The upper region (unshaded) corresponds to medium 1 with index n1, and the lower region (shaded light yellow) corresponds to medium 2 with index n2. A red ray of light is incident from medium 1 toward the boundary at an angle greater than the critical angle. It reflects entirely back into medium 1, illustrating total internal reflection. A dashed vertical line indicates the normal to the interface. The critical angle depends on: O n1 only n2 only O both n1 and n2 Submit