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Optics Review
4.1 to 4.3Light to colour
4.1 Producing Light
Incandescent light is the result of:a)Heating electronsb)Living organismsc)Chemical reactionsd)All of the above
4.1 Producing Light
Incandescent light is the result of:a)Heating electronsb)Living organismsc)Chemical reactionsd)All of the above
Identify the type of light produced as incandescent
or luminescent
A
incandescent
A
Identify the type of light produced as incandescent
or luminescent
B
incandescent
B
Identify the type of light produced as incandescent
or luminescent
C
luminescent
C
Identify the type of light produced as incandescent
or luminescent
D
luminescent
D
Identify the type of light produced as incandescent
or luminescent
E
luminescent
E
Identify the type of light produced as incandescent
or luminescent
F
incandescent
F
Identify the type of light produced as incandescent
or luminescent
G
luminescent
G
Identify this structure.Label A,B and C
It’s a wave – the distance between two crests
What is this a diagram of?
Electromagnetic spectrum
What colours make up the visible light?
• Red• Orange• Yellow• Green• Blue• Indigo• Violet
Match the wavelengths
• A) atom• B) bee• C) football field• D) bacteria
• A) x-rays• B) microwaves• C) radio waves• D) infrared
Sort these wavelengths from longest to shortest
A)How does light travel? B)What symbol is used to
show this?
• In a straight line
• A ray
Laser
Explain how we see objects (use a diagram)
Light travels from a source to an object
Light reflects from the object into our eyes
Identify the type of material used and the transmission:
glass
Wax pape
r
Brick wall
A
C
B
Identify the type of material used and the transmission:
glass
A)Transparent – light travels through
Wax pape
r
C)Translucent – some light travels through but is scattered, and some is reflected
Brick wall
B) Opaque – no light travels through it is all reflected
Explain why see the red apple as “red”
White light hits the apple
But only red is reflected
Why do we see blue and yellow panes of stained
glass?
Why do we see blue and yellow panes of stained
glass?• The glass is
transparent so light travels through it
• There is a pigment in the glass, so that colour is transmitted (.i.e blue) and all other colours are absorbed.
Why do we see colours?
• We see colours because the come cells in our eyes respond to R, G, B wavlengths of light
State the Additive Primary Colours
Red
Green
Blue
State the Additive Secondary Colours
yellow
cyan
magenta
State the Subtractive Primary Colours
yellowcyan magenta
State the Subtractive Secondary Colours
bluered
green
What are complementary colours?
• Colours that are opposite each other on the colour wheel
• The secondary colour and the primary colour that are opposite each other
• i.e. red is complementary to cyan
magenta film
R G B
White light
Write the colour equation for:
magenta film
R G B
White light
W - G =
BR
(R +B)
Good luck
