If the incident angle is greater than the critical angle, all of the light is:

1. Beyond the critical angle nothing crosses the boundary. 2. The critical angle is defined by the angle of refraction it produces. 3. If the incident angle is greater than the critical angle, all of the light is reflected back into medium 1. 4. That condition is called total internal reflection. _Source: OpenStax College Physics for AP Courses 2e (CC BY 4.0), Ch 25 'Geometric Optics', sections 25.1-25.7_