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Define Refraction
When light travels from one medium into another it bends

Label This Diagram
Refraction
a - incidence ray
b - refracted ray
c - normal
d - angle of incidence
e - angle of refraction
f - air
g - glass
State the laws of refraction • 1
Incident ray, normal and refracted ray all lie on the same plane
State the laws of refraction • 2
Snells Law - The sine of the angle of incidence is proportional to the sine of the angle of refraction
Define Refractive Index (n)
The ratio of the sine of the angle of incidence to the ratio of the angle of refraction when light travels from a vacuum to a medium

Label This Formula
Refractive Index - Snells Law
n - refractive index
i - angle of incidence
r - angle of refraction
What page of the log tables can you find the Refractive Index (Snells Law) Formulae?
60
State This Formula
Refractive Index - Depth
n = real depth / apparent depth