What is the effect of increasing the angle of incidence beyond the critical angle?

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When the angle of incidence exceeds the critical angle, the phenomenon that occurs is known as total internal reflection. At angles greater than the critical angle, light cannot refract into the less dense medium (like air); instead, it is completely reflected back into the denser medium (such as glass or water). This is because the refractive index of the denser medium is higher than that of the less dense medium, and the light cannot "escape" due to the geometry of the wavefronts.

In the context of this situation, the other options do not accurately describe the outcome. Light does not exit the medium unhindered, nor is it absorbed completely, as total internal reflection allows for the light to be redirected rather than lost. Refracted light does not occur beyond the critical angle since the required conditions for refraction cannot be satisfied at these angles. Therefore, the correct understanding of increasing the angle of incidence beyond the critical angle is that all light is reflected back into the denser medium.