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Questions and Answers
Total internal reflection occurs when light travels from a rarer medium to a denser medium.
Total internal reflection occurs when light travels from a rarer medium to a denser medium.
False (B)
If the angle of incidence is equal to the critical angle, the refracted ray travels perpendicular to the surface separating the two media.
If the angle of incidence is equal to the critical angle, the refracted ray travels perpendicular to the surface separating the two media.
False (B)
Total internal reflection does not adhere to the fundamental laws of reflection.
Total internal reflection does not adhere to the fundamental laws of reflection.
False (B)
The critical angle is defined as the angle of incidence in the rarer medium for which the angle of refraction in the denser medium is 90 degrees.
The critical angle is defined as the angle of incidence in the rarer medium for which the angle of refraction in the denser medium is 90 degrees.
For total internal reflection to occur, the angle of incidence must be smaller than the critical angle.
For total internal reflection to occur, the angle of incidence must be smaller than the critical angle.
When light undergoes total internal reflection, some of the light is refracted into the rarer medium.
When light undergoes total internal reflection, some of the light is refracted into the rarer medium.
If the refractive index of a denser medium is $n'$ with respect to a rarer medium, and the angle of incidence is the critical angle C, then the relationship can be described as: $n' = sin(C)$
If the refractive index of a denser medium is $n'$ with respect to a rarer medium, and the angle of incidence is the critical angle C, then the relationship can be described as: $n' = sin(C)$
In total internal reflection, both the angle of incidence and the angle of refraction are measured in the denser medium.
In total internal reflection, both the angle of incidence and the angle of refraction are measured in the denser medium.
Flashcards
Critical Angle
Critical Angle
The angle of incidence in a denser medium that results in a 90° angle of refraction when light travels to a rarer medium.
Total Internal Reflection
Total Internal Reflection
The complete reflection of light back into a denser medium when light travels to a rarer medium at an angle of incidence greater than the critical angle.
Conditions for TIR
Conditions for TIR
Light must travel from a denser to a rarer medium, and the angle of incidence must exceed the critical angle.
Angle of Incidence
Angle of Incidence
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Angle of Refraction
Angle of Refraction
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Refraction
Refraction
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Refractive Index
Refractive Index
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Law of Reflection
Law of Reflection
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Study Notes
Total Internal Reflection
- When light moves from a denser to a rarer medium, the refracted ray bends away from the normal.
- At a specific angle of incidence, the refracted ray travels parallel to the surface separating the two media.
- Critical angle is the angle of incidence in the denser medium that results in an angle of refraction of 90° in the rarer medium and is represented as 'C'.
- If the angle of incidence exceeds the critical angle, the ray reflects back into the denser medium; this phenomenon is total internal reflection.
- Total internal reflection is complete reflection of light back into a medium when light travels from a denser to a rarer medium, and the angle of incidence in the denser medium is greater than the critical angle.
- Total internal reflection follows the laws of reflection, where the angle of incidence equals the angle of reflection.
- Total internal reflection happens if:
- Light travels from a denser to a rarer medium.
- The angle of incidence in the denser medium is greater than the critical angle.
Refractive Index
- If the refractive index of the denser medium with respect to the rarer medium is 'n', and the angle of incidence in the rarer medium is the critical angle 'C', then the angle of refraction in the rarer medium is 90°.
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Description
Explanation of total internal reflection, including the conditions necessary for it to occur. Covers critical angle and the behavior of light as it moves between media with different refractive indices. Total internal reflection follows the laws of reflection, where the angle of incidence equals the angle of reflection.
