A planar structure of length L and width W is made of two optical media of refractive indices n₁ = 1.5 and n₂ = 1.44 as shown. If L >> W, a ray entering from AB emerges from CD only if total internal reflection occurs inside the structure. For L = 9.6 m, the maximum exit time is t × 10⁻⁹ s. Find t. [c = 3 × 10⁸ m s⁻¹]:
Physics · Geometrical optics · law of refraction and total internal reflection
A planar structure of length L and width W is made of two optical media of refractive indices n₁ = 1.5 and n₂ = 1.44 as shown. If L >> W, a ray entering from AB emerges from CD only if total internal reflection occurs inside the structure. For L = 9.6 m, the maximum exit time is t × 10⁻⁹ s. Find t. [c = 3 × 10⁸ m s⁻¹]:
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