What does singly refractive (isotropic) mean?

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Multiple Choice

What does singly refractive (isotropic) mean?

Explanation:
Isotropy means the optical properties are the same in every direction. When a material is isotropic, light has a single refractive index and does not split into two rays at a boundary, so it is singly refractive. This is exactly what the paired term describes, making it the best match. In contrast, anisotropic materials have direction-dependent indices and can cause birefringence (double refraction), which is the opposite behavior.

Isotropy means the optical properties are the same in every direction. When a material is isotropic, light has a single refractive index and does not split into two rays at a boundary, so it is singly refractive. This is exactly what the paired term describes, making it the best match. In contrast, anisotropic materials have direction-dependent indices and can cause birefringence (double refraction), which is the opposite behavior.

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