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Questions and Answers
Which of the following properties of light changes when it is refracted?
Which of the following properties of light changes when it is refracted?
- Power
- Frequency
- Intensity
- Wavelength (correct)
If $n_2 = 1.13$, what is the value of $n_1$ if $2n_1 = 0.98$?
If $n_2 = 1.13$, what is the value of $n_1$ if $2n_1 = 0.98$?
- 0.68
- 1.13
- 0.88
- 0.78 (correct)
What is the speed of light in glass with a refractive index of 1.5?
What is the speed of light in glass with a refractive index of 1.5?
- $2\times10^8$ (correct)
- $3\times10^8$
- $1\times10^8$
- $4\times10^8$
A higher index of refraction means that the wave travels _________ the speed of light in a vacuum in that medium.
A higher index of refraction means that the wave travels _________ the speed of light in a vacuum in that medium.
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The refractive index of water is 1.32. If the incidence angle of a falling light ray is 30 degrees, what is the angle of refraction?
The refractive index of water is 1.32. If the incidence angle of a falling light ray is 30 degrees, what is the angle of refraction?
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Study Notes
Refraction of Light
- When light is refracted, its frequency remains constant, but its wavelength and speed change.
- The refractive index of a medium is a measure of how much the light is slowed down in that medium.
- The formula to calculate the refractive index is $n = \frac{c}{v}$, where $c$ is the speed of light in vacuum and $v$ is the speed of light in the medium.
Calculating Refractive Index
- If $n_2 = 1.13$ and $2n_1 = 0.98$, then $n_1 = \frac{0.98}{2} = 0.49$.
Speed of Light in a Medium
- The speed of light in glass with a refractive index of 1.5 is $c / 1.5 = \frac{2}{3}c$.
- A higher index of refraction means that the wave travels slower than the speed of light in a vacuum in that medium.
Snell's Law
- The refractive index of water is 1.32.
- If the incidence angle of a falling light ray is 30 degrees, Snell's Law can be used to calculate the angle of refraction.
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