Refraction occurs when waves travel from one material to another. For light, this can change both the speed and direction. Refraction of light takes place in many places, including lenses and prisms.
At the boundary, when light passes from air into glass
It always changes direction
It sometimes changes direction
It never changes direction
What happens to the speed of light when it passes from air into glass?
It does not change
In which application is total internal reflection the principle used to transmit energy?
Fibre optic cables
When a ray of light from air enters a block of glass at an angle, what change in direction will the ray take?
The ray will move towards the normal
The ray won't move at all
The ray will move away from the normal
What letters indicate angles of incidence?
B and F
A and E
A and P
What letters indicate angles of refraction?
E and U
P and T
B and Q
What angles could be used to obtain a value for the refractive index of the glass?
B and D
R and S
Which of these do not change when a wave travels from one medium to another?
What principle do fibre optic cables rely upon in order to operate in telecommunication systems?
Total Internal Reflection
Modern spectacles are made from glass which has a higher refractive index than those of 20 years ago.
What effect has this had on the lenses?
They can become more curved
They can be thinner
They can be thicker