4639793
Description
Mind Map by Josh Anderson, updated more than 1 year ago
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Created by Josh Anderson
about 8 years ago
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Physics - P3 - AQA - GCSE - Refractive Index
- Refraction - the
change in direction
when a wave enters
a different medium
- E.G. Air into glass
- Caused by the change in
density in the medium
- Changes the speed of the wave
- Changes the speed of the wave
- E.G. Air into glass
- Speed of waves
- Decrease
- Bends towards the normal
- Bends towards the normal
- Increase
- Bends away from the normal
- Bends away from the normal
- If the wave hits the
medium at 90° (along
the normal) it does not
refract, but the speed
will change.
- Decrease
- The normal is a line at an angle of
90° against the surface of the
point of entry on the medium.
- Refractive index - (when referring
to a medium) the ratio of speed
of light in a vacuum to speed of
light in that medium
- If an incident ray passes from one
medium into another, the angle of
refraction of the ray is affected by
the refractive index of the material.
- Refractive index = sin(incident)/sin(refraction)
- n=sin i/sin r
- Find out the refractive index of the medium below.
- n = sin i/sin r
- n = sin 55/sin 33
- n = 0.819/0.545
- n = 1.50
- Refractive index is 1.5
- Refractive index is 1.5
- n = 1.50
- n = 0.819/0.545
- n = sin 55/sin 33
- What if we knew the refractive index
but not the angle of refraction?
- n = sin i/sin r
- 1.5 = sin 55/sin r
- sin r = sin 55/1.5
- sin r = 0.5461...
- Inverse sin 0.5461... = 33
- r = 33°
- r = 33°
- Inverse sin 0.5461... = 33
- sin r = 0.5461...
- sin r = sin 55/1.5
- 1.5 = sin 55/sin r
- n = sin i/sin r
- n = sin i/sin r
- n=sin i/sin r
- If an incident ray passes from one
medium into another, the angle of
refraction of the ray is affected by
the refractive index of the material.
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