Reflection for Term 3

What was covered:
This term was basically on physics, light. Although it is only one topic, it is a very big topic and is quite hard to understand some of the time because it's quite complicated.

Test:
I feel that I did not do as well as I expected, which was an A1 since most of the class scored an A1 and I was pretty confident. However, what I got was a B3, 27.5/40. I was very disappointed. However, I will study harder to get a high A1 for my EOY science.

Reflection of Light:

Light is reflected off a surface and reaches our eyes. That is the only way we can see an object.

There are several key terms that are used.

> Incident Ray: The light ray that hits the surface
> Reflected Ray: The light ray that is reflected away from the surface
> Normal: Line which is perpendicular to the surface at the point of incidence
> Point of incidence: Point where incident ray hits the surface
> Angle of incidence: Angle between the incident ray and the normal(perpendicular to surface)
> Angle of reflection: Angle between the reflected ray and the normal(perpendicular to surface)

There are two types of reflection:
> Specular Reflection : light from a single incoming direction is reflected to a single outgoing direction. (when light hits a smooth surface)
> Diffused Reflection : light from a single incoming direction is reflected to many different outgoing directions. (when light hits a rough surface)

The image we see in a mirror is virtual. Our brain processes that the image in coming from behind the mirror, thus making it virtual. This is because if a screen is put behind the mirror, no light or image would be caught.
These type of images have these characteristics:
>same size and shape as the object
>laterally inverted
>same distance away from the mirror as object

Refraction of light:
When light strikes a surface, some light is reflected while some light will be absorbed by the surface. For example, in a air to glass surface, light is reflected off the surface and partially transmitted through the glass. When light is transmitted through the glass, it will bend as it travels from the glass into the air.

When light moves from a less dense to a more dense environment, the light ray is refracted and bent towards the normal.

Reflection:
To me, this topic is confusing but at the same time interesting if able to grasp hold of the concept. However, ms nada did not come and teach us for a period of time and the relief teachers confused me when they taught about different things or things we did not learn.