免费全反射临界角计算器
计算光线发生全内反射的临界入射角。
Critical Angle
41.81 °
Critical Angle vs Denser Medium Refractive Index
公式
## Critical Angle The critical angle is the angle of incidence above which total internal reflection occurs when light travels from a denser to a less dense medium. ### Formula **theta_c = arcsin(n2 / n1)** where n1 > n2. Above this angle, no light passes through the boundary.
计算示例
Light going from glass (n=1.5) to air (n=1).
- 01theta_c = arcsin(n2/n1)
- 02theta_c = arcsin(1/1.5)
- 03theta_c = arcsin(0.667)
- 04theta_c = 41.81°
常见问题
What is total internal reflection?
When light hits a boundary at an angle greater than the critical angle (going from denser to less dense medium), all light is reflected back with no transmission.
How do fiber optics work?
Light enters the fiber and hits the cladding boundary at angles exceeding the critical angle, so it bounces along the fiber with minimal loss.
Why do diamonds sparkle so much?
Diamond has a very high refractive index (2.42), giving a small critical angle (~24.4°). Light enters but undergoes many total internal reflections before exiting, creating brilliance.
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