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Total Internal Reflection quiz

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  • What is total internal reflection?
    Total internal reflection occurs when light is completely reflected inside a material instead of refracting, typically when moving from a higher to a lower index of refraction.
  • When does total internal reflection occur?
    It occurs when light passes from a material with a higher index of refraction to one with a lower index and the angle of incidence exceeds the critical angle.
  • What happens to light as it passes from a higher to a lower index of refraction?
    The light bends away from the normal as it refracts.
  • What is the critical angle in total internal reflection?
    The critical angle is the angle of incidence at which the refracted ray is parallel to the boundary between two materials.
  • How is the critical angle defined in terms of the refracted ray?
    At the critical angle, the refracted ray makes a 90-degree angle with the normal, meaning it travels along the boundary.
  • What happens to light rays with angles greater than the critical angle?
    They are totally reflected back into the material, rather than refracted.
  • What equation is used to calculate the critical angle?
    The critical angle is calculated using theta critical = sin inverse (n2/n1).
  • What condition must be met for total internal reflection to occur?
    Total internal reflection only occurs when n2 is less than n1, meaning the light moves from a higher to a lower index of refraction.
  • What is the value of sine of 90 degrees used in the critical angle calculation?
    The sine of 90 degrees is 1.
  • What happens to the refracted ray at the critical angle?
    The refracted ray becomes perfectly parallel to the surface, making a 90-degree angle with the normal.
  • What is the critical angle for light moving from glass (n1 = 1.46) to air (n2 = 1.0)?
    The critical angle is 43.2 degrees.
  • How do you know if the critical angle equation is applicable?
    The equation is only applicable if n2 is less than n1.
  • What happens to light rays with angles less than the critical angle?
    They are refracted into the second material.
  • What does Snell's Law state for the critical angle scenario?
    Snell's Law gives the critical angle when the refracted angle is 90 degrees, leading to the formula theta critical = sin inverse (n2/n1).
  • What is the physical significance of total internal reflection?
    It allows light to be completely reflected within a material, which is used in applications like fiber optics.