TIR and reflection

Question 1

When can total internal reflection happen?

Answer 1

when waves travel from a material of a high refractive index to one of a lower refractive index

Question 2

What happens when the angle of incidence is lower than the critical angle?

Answer 2

normal refraction happens

Question 3

What happens when the angle of incidence is equal to the critical angle?

Answer 3

there is refraction along the boundry

- the angle of refraction is 90

Question 4

What happens when the angle of incidence is higher than a critical angle?

Answer 4

total internal reflection happens

Question 5

equation for the critical angle and why is it this?

Answer 5

sinc = 1/n
as the refractive angle is 90 making sin(90) = 1
n =1 as one of them is air

Question 6

what is total internal reflection

Answer 6

when all the light is reflected back into the material

Question 7

If the incident ray is perpendicular, and the angle of incidence is 90°

Answer 7

hen the light ray will pass undeviated. So the angle of refraction would be 0° as there is no refraction of light ray,