AS2 2.2 Refraction Flashcards
what are the two laws of light?
refraction and reflection
What is the angle of incidence?
The angle of incidence is the angle between the normal and the incident ray
name 3 examples of refraction
glasses, binoculars, magnifying glass
What is the angle of refraction?
The angle of refraction is the angle between the normal and the refracted ray
what is refraction?
the change of direction of a light ray when entering a medium with a different refractive index. the change in direction occurs because of the change of speed of light
Direction of Refraction
- When a light ray passes into a more dense material, the ray bends towards the normal
- When a light ray passes into a less dense material, the ray bends away from the normal
What are the requirements for refraction?
- The ray passes into a material with a different refractive index
- The angle of incidence must be bigger than 0
what is L.T.M and M.A.L?
Less dense
Towards the normal
More dense
More dense
Away from normal
Less dense
what is the angle of incidence?
the angle between the incident ray and normal
what is the angle of refraction?
the angle between the refracted ray and the normal
what happens to the speed, frequency and the wavelength of light change when its refracted?
less to more dense - speed and wavelength decrease
more to less dense - speed and wavelength increase
frequency remains constant
what is the equation for the refractive index from a less to more dense medium?
n = c / v
n = refractive index
c = speed of light in material 1
v = speed of light in material 2
what is Snell’s law?
At the boundary between two media, the ratio of the sine of the angle of incidence to the sine of the angle of refraction (sin i / sin r) is constant
what is the Snell’s law equation for the refractive index from the less to more dense medium?
n = sin(i) / sin(r)
