A ray being deflected in passing obliquely through the interface between one medium and another or through a medium of varying density
The bending of light when it travels from one material (medium into another is called refraction
Light travels at the speed of 3.00 x 10 to the power of 8 m/s in a vacuum
Angle of refraction- the angle between the refracted ray and the normal
1) The incident, refracted and normal ray all lie in the same plane. The incident ray and the refracted ray are on opine that separate the opposite sides of the two media
2) Light bends towards the normal when the speed of light in the second medium is less than the speed of light in the first medium
Light bends away from the normal when the speed of light n the second medium is greater
The brain thinks that the object in a medium like water is behind where it really is because light is refracted away from the normal when travelling from water into air.
Refraction is often accompanied by reflection that strikes water is reflected off the water. This is called partial reflection and refraction.
Refraction is the bending or change in direction of light when it travels from one medium into another
The speed of light depends on the medium that is passing through
Light bends towards the normal when it slows down in a medium and away the normal when it speeds up in medium
Light can undergo partial reflection and refraction at the same time at a surface
Pg. 524-525
Index or refraction- the ratio of speed of light in a vacuum to the speed of light in a medium, n= c/v, this value is also equal to the ratio of the sine of the angle of incidence a medium to the sine of the refracted ray in a medium. N= sin<I over sin<R
The speed of light in water is 2.25 x 10 to the power of 8 m/s
The speed of light is different for each medium, but is always less than the speed of light in a vacuum
Where n is the index of refraction, c is the speed of light in a vacuum, and v is the speed of light in a given medium
Because c and v are both speeds and can be expressed in the same units of m/s, the units in the equation divide out, so n has no units. This means that the index of refraction (n) is a dimensionless quantity
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