WorksheetsReflection Refraction and Wavelength
Total questions: 23
Worksheet time: 16mins
The higher the index of refraction, the faster light travels in that medium
True
False
When measuring critical angles and angles of incidence, reflection, refraction, measure from
the horizontal (where the barrier of the two mediums is)
the normal (perpendicular to where the barrier of the two mediums is)
wherever you want
Light traveling from a low index of refraction to a higher index of refraction will get faster and bends toward the normal.
True
False
Why does the pencil appear bent?
Light rays travel from parts of the pencil above the water to your eye and they bend away from the normal and appear closer to the horizontal surface.
Light rays travel from parts of the pencil under the water, through the air, and then into your eye. They bend toward the normal and appear farther from the horizontal surface.
Light rays travel from parts of the pencil under the water, through the air, and then into your eye. They bend away from the normal and appear closer to the horizontal surface.
Using Snell's Laws, set up how you would solve for the index of refraction of a refractive liquid if the angle of incidence in the air (n = 1) is 35 degrees and the angle of refraction is 14 degrees? Then solve.
n (sin35) = (1)(sin14) ... n = 0.42
n (sin35) = (1)(sin14) ... n = 2.37
(1)(sin35) = n (sin14) ... n = 2.37
(1)(sin35) = n (sin14) ... n = 0.42
If light is traveling from air to water with an angle of INCIDENCE of 40 degrees, what is the angle of refraction? (n=1 air, n=1.33 water)
48 degrees
2.07 degrees
11.9 degrees
28.9 degrees
A person shines a light at a friend who is swimming underwater. If the ray in the water makes an angle of 36.2 with the normal, what is the angle of incidence?
(n=1 air, n=1.33 water)
26.4 degrees
2.25 degrees
51.8 degrees
not possible
A ray of light enters the top of a glass of water at an angle of 36 degrees with the vertical. What is the angle between the refracted ray and the vertical?
2.26 degrees
26.2 degrees
51.4 degrees
36.5 degrees
_____ cables transmit beams of light without allowing any of the light to escape until it gets to the end of the cable.
Ethernet
Fiber optic
Copper
Coaxial
Fiber optic cables work because of the principle of _____.
total internal refraction
incomplete internal refraction
total internal reflection
partial internal reflection
How could lasers create a signal to send through a fiber optic cable?
The laser could change the frequency/wavelength of the light to transmit the specific signal.
The laser could send timed flashes of light to transmit the specific signal.
What is true about light during total internal reflection?
The angle of incidence is greater than the critical angle.
The angle of reflection is the same as the critical angle.
The angle of refraction is less than the critical angle.
The angle of incidence is zero.
Which of the following statement about optical fibers is incorrect?
Light is totally internally reflected down the fiber.
They are used in medical the medical field (in endoscopes).
They are used to send signals between cell towers.
The angle of incidence of light in an optical fiber must be less than critical angle.
If light hits at an angle larger than the critical angle it will refract and pass through the material
True
False
For total internal reflection to occur, the light has to
travel from a less dense medium to a denser medium (so it will slow down).
travel from a denser medium to a less dense medium (so it will speed up).
Total Internal Reflection can only occur when light is traveling from a high index to a low index
True
False
When total internal reflection occurs the light will be received at the same angle it came in.
True - this is called the Law of Reflection
False - it depends
Why are fiber optic cables so efficient?
You can send multiple signals at the same time in both directions through the same fiber because light waves pass through each other.
They are indestructible.
They are the size of a human hair.
They are really easy to install.
How are multiple signals sent on one fiber optic cable at the same time?
There are lasers at different angles (that are all bigger than the critical angle).
There are lasers at different angles (that are all smaller than the critical angle).
Magic.
If the critical angle is 48 degrees, which of the following angles of incidence would result in internal reflection?
48 degrees
120 degrees
49 degrees
47 degrees
Light travels from glass (n = 1.66) to water (n = 1.33). What is the critical angle for these two mediums?
53.2 degrees
48.8 degrees
37 degrees
not possible
Light travels from air (n = 1) to water (n = 1.33), what is the critical angle?
48.8 degrees
46.4 degrees
52.4 degrees
not possible because the light would slow down when it changes mediums
Light travels from oil (n = 1.48) to water (n = 1.33) at an angle of 60 degrees relative to the normal. What will happen to the light? Hint: first decide if it will reflect or refract.
reflect back at an angle of 60 degrees
refract through at an angle of 74.5 degrees
refract through at an angle of 51.1 degrees
reflect back at angle of 30 degrees
