Characteristics of light
How we see Colour
Mirrors
Refraction
Lenses
100
What type of light source would a glow stick be?
Luminescent, because light thats generated by the energy is released in a chemical reaction.
100
What are the complimentary colours?
. Red-Cyan .Green-Magenta .Blue-Yellow
100
What does SALT stand for?
S ----> Size A ----> Attitude L ----> Location T ----> Type
100
Define refraction.
The change in direction of light when it crosses a boundary between two media.
100
What are lenses?
Lenses are thick pieces of glass or plastic that have at least one curved side.
200
What are the two types of light sources, do they give off heat?
Incandescent and Luminescent are the two types of light sources. .Incandescent lights give off heat .Luminescent lights do not give off heat.
200
Fill in the blanks: To add colours, you need _________ that can _______________________.
First blank: Sources Second blank: Reach an observers eye.
200
List the 3 steps for how to draw a ray diagram for plane mirrors.
1. Draw a normal ray from the object to the mirror and extend it behind the mirror 2. measure the distance between the object and the mirror along the normal 3. Locate the image
200
What is the cause of refraction?
Light refracts because light travels at different speeds and in different media. When light moves from a media that is less dense to a media that is more dense, light bends TOWARDS the normal. When light moves from a media that is more dense to a media that is less dense, light bends AWAY from the normal.
200
How are lenses used in everyday life? give 4 examples.
.Eyes .Projectors .Telescopes .Glasses
300
List the 4 types of luminescent light and the 2 Incandescent.
Luminescent: Bioluminescent organisms, glow sticks, glow in the dark wall decals and compact fluorescent light bulbs. Incandescent: Electric discharge and light bulbs.
300
Fill in the blank: When an object absorbs a colour, __________or ( ) _______________of light. The colours of mostly all objects that you _________ everyday are the results of ________________.
First blank: it removes or (subtracts) Second blank: the beam Third blank: observe Fourth blank: subtracting colours
300
List the 4 characteristics of a plane mirror.
.The size of the image is the same as the size of the object .The image distance is equal to the object distance .The image is always oriented in the same direction as the object is .They are always virtual images, located behind the mirror.
300
Describe how total internal reflection is related to refraction.
When the angle of incidence is too large the angle of refraction passes the boundary between substances and becomes a refracted ray.
300
why do lenses have TWO focal points?
Lenses have two focal points because you can see through both sides.
400
Fill in the blank: Light that is produced by living organisms, chemical reactions in the living cell produce light. Common in ______________. What type of light source is it?
Blank: Marine organisms Light source: Bioluminescent organisms.
400
Fill in the blanks: When you ____ ___________ colours, the result is _______. When you ________ __________ colours, the result is _______.
Fisrt blank: add Second blank: complamentary Third blank: white Fourth blank: subtract Fifth blank: complamentary Sixth blank: black
400
When drawing a diagram for plane mirrors what is the type of method used? What does "do" and "di" mean?
When drawing a diagram for plane mirrors, use the Normal method. "do" ----> Distance from the object "di" ----> Distance from the image
400
Fill in the blanjks: Light can reflect and refract when it reaches some substances: When the ________________ of the light ray is small: __________________ is also small. When the angle of incidence of the __________ is large: the angle of refraction ______________.
First blank: angle of incidence Second blank: the angle of refraction Third blank: the light ray fourth blank: gets bigger
400
Define what the following points are. .F .F1 .O
F ----> Focal point on the left side F1 ----> "F prime" focal point on the right side O ----> Optical centre of lenses
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