



Students in a lab group are given a plastic cube with a hollow cubeshaped space in the middle that fills about half the volume of the cube. The index of refraction of the plastic is known. The hollow space is filled with a gas, and the students are asked to collect the data needed to find the index of refraction of the gas. What information would you need to collect, and how would you use this information in order to deduce the index of refraction of the gas in the cube?
First, measure the angle of incidence and the angle of refraction for light entering the plastic from air. Since the two angles can be measured and the index of refraction of air is known, the student can solve for the index of refraction of the plastic.
Next, measure the angle of incidence and the angle of refraction for light entering the gas from the plastic. Since the two angles can be measured and the index of refraction of the plastic is known, the student can solve for the index of refraction of the gas.
Got questions? Get instant answers now!
Light travels through water and crosses a boundary at a nonnormal angle into a different fluid with an unknown index of refraction. Which of the following is true about the path of the light after crossing the boundary?
 If the index of refraction of the fluid is higher than that of water, the light will speed up and turn toward the normal.
 If the index of refraction of the fluid is higher than that of water, the light will slow down and turn away from the normal.
 If the index of refraction of the fluid is lower than that of water, the light will speed up and turn away from the normal.
 If the index of refraction of the fluid is lower than that of water, the light will slow down and turn toward the normal.
Got questions? Get instant answers now!
A laser is fired from a submarine beneath the surface of a lake (
n = 1.33). The laser emerges from the lake into air with an angle of refraction of 67°. How fast is the light moving through the water? What is the angle of incidence of the laser light when it crosses the boundary between the lake and the air?
The speed of light in a medium is simply
c /
n , so the speed of light in water is 2.25 × 10
^{8} m/s. From Snell’s law, the angle of incidence is 44°.
Got questions? Get instant answers now!
Section summary
 The changing of a light ray’s direction when it passes through variations in matter is called refraction.
 The speed of light in vacuum
$c=2\text{.}\text{9972458}\times {\text{10}}^{8}\phantom{\rule{0.25em}{0ex}}\text{m/s}\approx 3\text{.}\text{00}\times {\text{10}}^{8}\phantom{\rule{0.25em}{0ex}}\text{m/s}.$
 Index of refraction
$n=\frac{c}{v}$ , where
$v$ is the speed of light in the material,
$c$ is the speed of light in vacuum, and
$n$ is the index of refraction.
 Snell’s law, the law of refraction, is stated in equation form as
${n}_{1}\phantom{\rule{0.25em}{0ex}}\text{sin}\phantom{\rule{0.25em}{0ex}}{\theta}_{1}={n}_{2}\phantom{\rule{0.25em}{0ex}}\text{sin}\phantom{\rule{0.25em}{0ex}}{\theta}_{2}$ .
Conceptual questions
Diffusion by reflection from a rough surface is described in this chapter. Light can also be diffused by refraction. Describe how this occurs in a specific situation, such as light interacting with crushed ice.
Got questions? Get instant answers now!
Does the fact that the light flash from lightning reaches you before its sound prove that the speed of light is extremely large or simply that it is greater than the speed of sound? Discuss how you could use this effect to get an estimate of the speed of light.
Got questions? Get instant answers now!
Questions & Answers
how did you get the value of 2000N.What calculations are needed to arrive at it
Privacy Information Security Software Version 1.1a
Good
displacement in easy way.
binding energy per nucleon
Because HE needs someone to dominate the earth (Gen. 1:26)
Olorunfemi
why god made humenity
Ali
Is the object in a conductor or an insulator? Justify your answer. whats the answer to this question? pls need help figure is given above
how do i calculate the pressure on the base of a deposit if the deposit is moving with a linear aceleration
why electromagnetic induction is not used in room heater ?
what is charging by induction
what is electric field lines
Suppose a 0.250kg ball is thrown at 15.0 m/s to a motionless person standing on ice who catches it with an outstretched arm as shown in [link] . (b) What is his angular velocity if each arm is 5.00 kg? You may treat the ball as a point mass and treat the person's arms as uniform rods (each has a length of 0.900 m) and the rest of his body as a uniform cylinder of radius 0.180 m. Neglect the effect of the ball on his center of mass so that his center of mass remains in his geometrical center.
Source:
OpenStax, College physics for ap® courses. OpenStax CNX. Nov 04, 2016 Download for free at https://legacy.cnx.org/content/col11844/1.14
Google Play and the Google Play logo are trademarks of Google Inc.