Refractive Index

Question 1

What is refraction?

Answer 1

When waves change direction as they enter a different medium. This is caused by he change in density from one medium to the other - which changes the speed of the waves

Question 2

When waves slow down, they bend towards the …

Answer 2

Noral

Question 3

When light enters glass or [ ] it slows down to about [ ] of its speed in air

Answer 3

plastic

2/3

Question 4

If a wave hits a boundary at 90° ( the [ ] ) it will not change direction but it will still [ ]

Answer 4

normal

Slow down

Question 5

When light hits a different medium some of the light will pass through the new medium but some will be [ ] - it all depends on the [ ]

Answer 5

reflected

angle of incidence

Question 6

What is the angle of incidence?

Answer 6

The angle at which the wave hits the medium. Angle between the normal and the wave

Question 7

Every [ ] has a refractive index

Answer 7

Transparent

Question 8

What is the refractive index of a medium?

Answer 8

The ration of speed of light in a vacuum to the spped of light in that medium

Question 9

What 2 things does the refractive index link? What is the symbol of refractive index?

Answer 9

Angle of incidence (i)
Angle of refraction (r)
Refractive Index (n)

Question 10

What is the angle of refraction?

Answer 10

The angle INSIDE medium/block between the normal and the refracted ray.

Question 11

What is the equation for refractive index?

Answer 11

Refractive Index = Sin i / Sin r

Question 12

What, can we assume, is the refractive index of air?

Answer 12

1