Total internal reflection can occur only when light travels
Answer and explanation
Correct answer: A. from a denser to a less dense medium at an angle greater than the critical angle
Total internal reflection needs light in the denser medium striking the boundary beyond the critical angle.
Answer: from a denser to a less dense medium at an angle greater than the critical angle.
Why not the others: from a less dense to a denser medium at any angle: light entering a denser medium always refracts. from a denser to a less dense medium at an angle smaller than the critical angle: below the critical angle some light refracts out. from air into water at a large angle: air is less dense than water.
Answer: from a denser to a less dense medium at an angle greater than the critical angle.
Why not the others: from a less dense to a denser medium at any angle: light entering a denser medium always refracts. from a denser to a less dense medium at an angle smaller than the critical angle: below the critical angle some light refracts out. from air into water at a large angle: air is less dense than water.
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