Physics>Light

While revising for the physics common tests 2morrow on light, i went to look in the mirror and remembered that my eyes are brown... haha. i mean for so long i thought my eyes were black but it's actually brown. lol. ok. so since i've got nothing else to write about, i'll just recap on what i've just revised.
p.s: i was "revising". that means there were a few distractions here and there as i was revising in front of the com..

Light is a form of energy. The speed of light is faster than the speed of sound. A storm can prove this theory right because we see lightning before we hear the thunder clap.

Objects can be classified into to groups; non-luminous objects and luminous objects.
Luminous objects are objects that emit their own light. We can see luminous objects because the light from these objects are reflected directly into our eyes.

Non-luminous objects do not emit there own light. We can see these objects
because they reflect light from light sources and this reflected light is reflected into our eyes.
That is why we can the moon as it reflects light from the Sun.

Shadows are formed because light travels in a straight line and cannot bend around behind the object. As some of the light is being blocked, the area behind the object will be dark. This dark area is called a shadow.

A solar eclipse happens when the moon comes between the Sun and the Earth. A shadow of the moon will be cast on the Earth. The people in this shadow area will experience an umbra - total eclipse. Solar eclipses only happen in daytime. Since there is people who would experience total eclipse, there would be those who would experience partial eclipse which is also known as penumbra.

Reflection is the bouncing of light off a surface.
When an incident ray is reflected on a plane mirror at an angle, the reflected ray will reflect at an equal angle but on the opposite side of the normal.

I went to a website to find out more about the law of reflection that the angle of incidence is always equal to the angle of reflection. There was a video on there. http://www.teachersdomain.org/resources/lsps07/sci/phys/energy/lightreflect/index.html
The video did not mention a thing about the angle of incidence and reflection. Instead, they mentioned the angle of incoming light and the angle of outgoing light.

There are two types of reflection; regular and diffuse.
Regular reflection happens on plane mirrors. Diffuse reflection happens on a rough surface.
Paper may seem smooth to our fingers but if paper was seen on a microscope, the surface is actually rough. That is why an image cannot be formed on rough surfaces. Hence, we cannot see our own image formed on them.

Characteristics of an image formed on a plane mirror

The image is upright, virtual, as far behind the mirror as the object is in front of the mirror, laterally inverted and has the same size as the object.

There are two types of curved mirrors; Convex and concave.

Convex mirrors are curved outwards.
Objects are seen smaller in convex mirrors but they allow a large field of view.

Concave mirrors are curved inwards. That's all i know about them.
I HOPE SOMEONE ENLIGHTENS ME.

lol

Refraction is the bending of light due to the traveling of light from one transparent material to another that are of different densities.

When light travels from a dense material to a denser material, the light will refract towards the normal.

When light travels from a dense material to a less dense material, the light will refract away from the normal.

Light travels slower in a denser material.

er, that's all i know about refraction.
I HOPE SOMEONE ENLIGHTENS ME.

lol. this is only the textbook. i haven't gone through all the notes. wish me luck for physics... onwards to CHEMISTRY! but first breakfast... haha