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Copy of Reflection of Light

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nic reyes

on 24 January 2014

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Transcript of Copy of Reflection of Light

Reflection of Light
Most objects you see on a daily basis are non-luminous. For you to be able to see the object, light has to reflect from the object to your eye. Objects can have either a rough surface, which will reveal their shape, colour, and texture, or a smooth surface, which can reflect things and produce an image. These reflecting surfaces are named according to their shape. Flat surfaces are called plane mirrors and the other smooth surfaces are called curved mirrors. There are two types of curved mirrors: concave mirrors and convex mirrors.

A rear view mirror is a curved
mirror that allows a larger field
of view for the driver.
The following are terms used to describe the way light reflects off of shiny surfaces:
: a straight line with an arrowhead which shows the path the light travels
incident ray:
the incoming ray that strikes a surface
reflected ray:
the ray that bounces off a reflective surface
a line drawn perpendicular to the mirror surface, where the incident ray strikes
the surface
angle of incidence:
the angle between the incident ray and the normal
angle of reflection:
the angle between the reflected ray and the normal
point of incidence:
point where the incident ray strikes the mirror
plane mirror:
a flat mirror (normal mirror from around your house)
When a ray of light strikes a reflective surface it reflects back in accordance with two laws.

1)The angle of incidence will be equal to the angle of reflection.

2) The incident ray, the reflected ray, and the normal are all on the same plane.
Types of Reflections
Terms Used in Reflection of Light
Laws of Reflections
Mirrors have been used for thousands of years. The first mirrors were made by polishing a volcanic rock called obsidian, which was glossy and black. Later the Greeks and Romans polished bronze to use as mirrors.
Did you know?
First Law of Reflection
The angle of incidence equals the angle of reflection.
Second Law of Reflection

The incident ray, the reflected ray and the normal all lie in the same plane.
The ray model of light includes the following statements:
Light travels in straight lines
It does NOT change direction unless something in its path happens. When light hits the boundary between two materials, it may change direction.
Light travels from the source in
all the directions.
Light travels in straight lines until it encounters an object. Some materials allow light to pass through, others absorb light, and some others reflect light. The nature of the material determines whether it will allow, absorb, or reflect light rays.

The difference between transparent, translucent, and opaque materials lies in the amount of light that each material is able to transmit.
When a material transmits all or almost all incident light
Objects can be clearly seen through the material
When a material transmits some incident light but absorbs or reflects the rest
Objects are not clearly seen through the material
When a material does not transmit any incident light
All incident light is either absorbed or reflected
Objects behind the material cannot be seen at all
Defined as any polished surface that reflects light.
When you are looking at yourself in a mirror you are looking at an image.
is a reproduction of an object through the use of light
When light is reflected, it can either be specular (regular) or diffused depending on the nature of the interface.
Types of Reflections
Regular (Specular) Reflection
The reflection of light off a flat, smooth surface
When rays are reflected from a smooth surface, they are reflected so that a clear image is formed.
Diffuse Reflection
The reflection of light off an irregular or rough surface
When rays are reflected from a rough surface, they are reflected in many directions and no clear image is formed.
Sir Nic!
glasswinged butterfly
wax paper
frosted glass
aluminum foil
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