5.1 Refraction Of Light Flashcards
What can the wave theory of light be used for
Explaining reflection and refraction of light
What is a normal
An imaginary line perpendicular to a boundary between two materials or a surface
What is refraction
The change of direction that occurs when light passes at an angle across a boundary between two transparent substances
A light ray bends _______ ___ ______ when it passes from air into glass
Towards the normal
A light ray bends _____ _____ ___ ______ if it passes from glass to air
Away from the normal
_____ ______ takes place if the incident light ray is along the normal
No refraction
At a boundary between two transparent substances, the light ray bends:
Towards the normal if it passes into a more dense substance
Away from the normal if it passes into a less dense substance
How to investigate the refraction of light by glass
Use a ray box to direct a light ray into a rectangular glass block at different angles of incidence at the midpoint P of one of the longer sides
What is the angle of incidence
The angle between the incident light ray and the normal at the point of incidence
What is snells law
Sin i/ Sin r is the same for each light ray
For a light ray travelling from air into a transparent substance, the refractive index of the substance=
n = sin i/sin r
Where does partial reflection occur
When a light ray in air enters glass or any other refractive substance
