WorksheetsRefraction and Total Internal Reflection -2
Total questions: 15
Worksheet time: 10mins
Why does the pencil appear bent?
Light rays travelling from parts of the pencil above the water bend away from the normal and appear closer to the horizontal surface, thus making the pencil appear broken.
Light rays travelling from parts of the pencil above the water bend towards from the normal and appear closer to the horizontal surface, thus making the pencil appear broken.
Light rays travelling from parts of the pencil under the water bend away from the normal and appear closer to the horizontal surface, thus making the pencil appear broken.
Light rays travelling from parts of the pencil under the water bend towards from the normal and appear closer to the horizontal surface, thus making the pencil appear broken.
What does part #2 in the system represent?
Light signals are what carries information in fiber optics
Digital signals are sent through fiber optic cables
Total internal reflection keeps the light inside of the cable
Lasers are the source of light that we send in fiber optics
Glass or plastic fiber optic cables carry information as light
If the light is travelling from glass with a wavelength of 600nm to diamond, then what is the wavelength in the diamond? (n of glass = 1.5 and n of diamond = 2.4)
236nm
256nm
610nm
375nm
After which angle of incidence will the light go through total internal reflection in the fibre optic pipe if the n for the pipe is 1.2.
AND what is the angle of refraction?
Outside is air. (Sin 60 - 0.87, Sin 45 = 0.7, Sin90 = 1, Sin 30 = 0.5, Sin 37 = 0.6, Sin 0 = 0, Sin, Sin 53 = 0.8, Sin 44 = 0.7, Sin 78.5 = 0.98)
Incident angle = 78.5 degrees, Angle of refraction = 45
Incident angle = 44 degrees, Angle of refraction = 37
Incident angle = 60 degrees, Angle of refraction = 53
Incident angle = 78.5 degrees, Angle of refraction = 30
Incident angle = 44 degrees, Angle of refraction = 78.5
As shown in the figure, the light beam makes an angle of 20 degrees with the normal inside linseed. Calculate the incident angle in air (theta) and the refracted angle in water (theta prime).
(n for linseed = 1.5, n for water = 1.3, n for air = 1, Sin 20 = 0.34, Sin 23 = 0.39, Sin 30 = 0.5, Sin 45 = 0.7, Sin 48.6 = 0.75, sin 56 = 83, Sin 60 = 0.87, Sin 37 = 0.6)
Theta = 23 degrees, Theta prime = 30 degrees
Theta = 30 degrees, Theta prime = 45 degrees
Theta = 48.6 degrees, Theta prime = 37 degrees
Theta = 30 degrees, Theta prime = 23 degrees
What is the refractive index of a fibre optic pipe if the critical angle is 30 degree?
Outside is air.
2.0
1.7
2.4
Choose the correct statement that describes what happens to the ray of light if the critical angle is 48o and the angle of incidence is 48o
refract
totally internally reflect
travel along the boundary
Which one is true for the formation of a mirage?
The light first goes through TIR and then passes through the colder layers of air to hotter layers. (TIR is total internal reflection)
The light first goes through TIR after passing through the colder layers of air to hotter layers.
The light first goes through TIR and then passes through the hotter layers of air to colder layers.
Which is true?
nb > nc > na
nc > nb > na
na > nc > nb
nb > na > nc
none of the above
A beam of light is incident on a prism of a certain glass at an angle (theta 1) of 23.5 degrees, as shown. If the index of refraction of the glass for violet light is 1.8, find phi-2.
Sin(23.5) = 0.4, Sin(11.5) = 0.2, Sin(78) = 0.98, Sin(14.5) = 0.25
phi-2 = 0.6 degrees
phi-2 = 12 degrees
phi-2 = 78 degrees
phi = 14.5 degrees
Chose the TWO conditions are NOT correct for total internal reflection to take place
The incident angle should be less than the critical angle
The incident angle should be greater than the critical angle
Light should travel from a denser to a lighter medium
Light should travel from a lighter to a denser medium
If the critical angle is between water and air is 48.6 degrees, what will the fish see at 60 degrees?
The object in the air
The object on the surface of the water
The object on the sea floor
nothing
Light is travelling from air to water. Which path will the light most likely follow?
A
B
C
D
E
If you make light incident on the spherical side of a semi-circular glass, what will happen to the light once it enters the glass and hits the flat surface inside?
It will bend towards the normal
It will go straight
It will bend away from the normal
All of it will reflect back into the air
