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Optics Test Part 1

Test review for optics test

QuestionAnswer
What is light? Light is a form of energy that can be detected by the human eye.
Natural light sources come from nature.
Artificial light sources are man-made light sources.
We see luminous objects because they give off their own light.
We see nonluminous objects because their surfaces reflect light.
In total darkness we see nothing.
The amount of light energy a surface receives depends on the intensity of the light.
Light always travels in a straight line from its source
Light travels in a straight line until it hits something and passes through, is reflected, scattered or absorbed
If light passes through a substance or object , it is called transparent.
If only some light passes through and the rest is scattered, it is called translucent.
If light is unable to pass through a substance or object , it is called opaque.
Pinhole camera camera obscura
The angle of incidence always equals the angle of reflection
The reflection of light off an irregular surface is called diffuse reflection.
Diffuse reflection scatters the reflected light and you can’t see an image.
The reflection of light off a smooth, shiny surface is called regular reflection.
Regular reflection allows you to see an image
Convex mirrors always produce a smaller, up-right image.
1. If a concave mirror is placed far away the image is upside down and smaller.
2. If a concave mirror is close to you, the image is up-right and bigger
Refraction the “bending” of light as it passes from one material into another.
Light bends because it travels at different speeds in different materials.
Light travels faster when there are less particles in the way (less dense)
The Law of Refraction (part 1) states that when light travels from one medium, to a more dense medium, the light will slow down and bend toward the normal,…
The Law of Refraction (part 2)…and when it exits a denser medium into a less dense medium, it will speed up and bend away from the normal.
Created by: devon science
 

 



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