Total Internal Reflection
Physics ⇒ Light and Optics
Total Internal Reflection starts at 10 and continues till grade 12.
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See sample questions for grade 10
A light ray in a diamond (n=2.42) strikes the diamond-air boundary. Calculate the critical angle.
A ray of light passes from glass (n=1.5) to water (n=1.33). Calculate the critical angle for this interface.
Define the critical angle in the context of total internal reflection.
Describe one medical application of total internal reflection.
Describe what happens to a light ray at the critical angle.
Describe what happens to a light ray when the angle of incidence is less than the critical angle at a denser to rarer medium boundary.
Explain why diamonds sparkle more than ordinary glass.
Explain why mirages are seen in deserts using the concept of total internal reflection.
Explain why optical fibers must have a core with a higher refractive index than the cladding.
Explain why rainbows are not formed by total internal reflection.
Explain why total internal reflection does not occur when light passes from air to water.
If the critical angle for a certain glass is 42°, what is the refractive index of the glass? (Assume air as the second medium, n=1.0)
If the refractive index of glass is 1.5 and that of air is 1.0, calculate the critical angle for total internal reflection at the glass-air boundary. (Use sin c = n₂/n₁)
State one difference between reflection and total internal reflection.
State the formula for calculating the critical angle between two media.
State two conditions necessary for total internal reflection to occur.
What is total internal reflection?
A light ray passes from a medium with refractive index n₁ into a medium with refractive index n₂. If n₁ = 1.70 and n₂ = 1.20, calculate the critical angle for total internal reflection at the boundary. (Give your answer to two decimal places.)
A light ray travels from a medium with refractive index 1.65 into a medium with refractive index 1.20. Calculate the minimum angle of incidence in the denser medium for total internal reflection to occur. (Give your answer to two decimal places.)
Describe how the refractive indices of the core and cladding in an optical fiber must be chosen to ensure total internal reflection of light within the core.
