Refraction Flashcards
What is refraction?
A change in direction of light as it passes from one optical medium to another of a different refractive index.
The more denser the material?
The slower the light travels.
What does a higher n mean
Slower light travels in medium
Why does n have to Bea transparent material?
So light can pass through
What is the refractive index of air
1
What are the rules of refraction?
-incident ray, reflected ray and the normal lie in the same place .
-snell’s law.
N1 sini= n2 sin r
What are the rules of refraction?
-incident ray, reflected ray and the normal lie in the same place .
-snell’s law.
N1 sini= n2 sin r
If we move from a high to low refractive index what happens to light
Light moves away from norm
If we move from low to high refractive index, what happens to light
Light moves towards normal
What is the critical angle
Refractive ray runs parallel to the interface
What happens if the angle of incidence is greater than the critical angle
The interface no longer refracts and acts like a mirror
What happens if the angle of incidence is greater than the critical angle
The interface no longer refracts and acts like a mirror
For total internal reflection to take place, which direction does light have to move from
High to low
Beyond the Critical angle there cannot be refraction so what occurs
Total internal reflection- mirror forms so reflection occurs
When an angle of of refraction is 90 so a straight line what is the called
Critical angle
