Wave Behaviour Flashcards
What is reflection?
When a wave shines on a reflecting surface like a mirror, it reflects back to the previous medium
What is incident ray?
Is a straight line which shows the direction of incident wave propagation
What is reflected Ray?
Is a straight line with an arrow to show the direction of reflected wave propagation
What is a normal line?
Is an imaginary perpendicular line on the reflecting surface
What is angle of incidence?
The angle between incident ray and normal line (i)
What is angle of reflection?
Is the angle between reflected ray and normal line (r)
What are the Laws of reflection?
- Incident ray, reflected ray, normal line all are on the same plane
- Angle of incidence and angle of reflection are the same no matter if the surface is smooth or rough
What is refraction?
When a wave meets a boundary between two transparent mediums, it doesn’t keep the direction it had before.
What happens when a refraction wave enters into the second medium?
When it enters the second medium, it has two options:
1. Coming closer to the normal line
2. Getting further away from the normal line. This depends on optical density of the second medium.
What happens to the refractive line when it enters a medium which is optically denser?
If the second medium is optically denser, the refractive wave comes closer to the normal line.
What happens to the refractive wave when the second medium is optically less denser?
If the second medium is optically less denser, the refractive line moves further away from the normal line.
Name the mediums from less dense to more dense
Vaccume< air<water<glass
What is the snell formula? And name each term of it
N1 Sin i = N2 Sin r
N1- Refractive index of first medium and indicates how optically denser is the medium
i- angle of incidence
N2- refractive index of the second medium
r- angle of refractive
What is Refractive index?
Is a constant number which shows how a transparent medium is optically dense
What is the refractive index of air and vacuum?
N=1
