Refraction of Light
Refraction is the change of direction that occurs then a light ray passes through a transparent object. Normal is the line perpendicular from the entry point of the light
* always bends towards the normal from air to glass
* bends away from the normal from glass to air
* bends toward the normal when passing into a more reactive substance and opposite for when it pass into a less reactive
refraction of light through glass
the refractive index is the speed of light in free space/ speed of light in the substance.
* refractive index = n, angle of incidence = i, and of refraction = r
n = sin i / sin r
so i = 40' and n= 1.5
rearrange: sin i / n = sin40 / 1.5 = 0.429
shift sin-1 therefore r = 25'