The Critical Angle Is That Angle of Incidence for Which

question 88

Short Answer

The critical angle is that angle of incidence for which the angle of refraction equals ______.

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Definitions:

Orbicularis Oculi

A circular muscle that surrounds the eye socket and allows for the closing of the eyelids.

Levator Palpebrae Superioris

A muscle in the orbit of the eye responsible for raising the upper eyelid, enabling the eye to open.

Eyelid

Movable fold of skin in front of the eyeball; also called palpebra.

Inferior Rectus

A muscle in the eye that contributes to downward gaze or moving the eye downward.