A look into how we see and what we see What is Light Light is a type of wave A wave is a disturbance that transfers energy from one point to another without transferring matter Eg Water waves ID: 242595
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Slide1
Light and Optics
A look into how we see and what we see.Slide2
What is Light?
Light is a type of
wave
.
A
wave
is a disturbance that transfers energy from one point to another without transferring matter.
Eg
. Water waves.
Light behaves like a special kind of wave, called an
electromagnetic wave
(a wave that has both electric and magnetic parts, does not require a medium, and travels at the speed of light). Slide3
The Electromagnetic Spectrum
The classification of waves is based on the energy emitted from the waves.
The visible spectrum is the sequence of colours of
visible light
.
There are 7 distinct colours: red, orange, yellow, green, blue, indigo and violet.Slide4Slide5
Colour Blindness
Color blindness (color vision deficiency) is a condition in which certain colors cannot be distinguished, and is most commonly due to an inherited condition.
Red/Green color blindness is the most common form.
Color blindness seems to occur more in males.
Total color blindness
(seeing in only shades of gray) is extremely rare. There is no treatment for color blindness.Slide6
For a colour blind individual, brightness of red, orange, and yellow is much reduced compared to normal.
This dimming can be so pronounced that reds may be confused with
black or dark gray
.
When driving, red traffic lights may appear to be extinguished.
They may learn to distinguish reds from yellows and from greens primarily on the basis of their apparent brightness or lightness, Violet, lavender, and purple are indistinguishable from various shades of blue.Slide7
A Comparison of a Traffic LightSlide8
Red-Green ColourblindSlide9
Colour Blind Test #1
What Number do you see?
Those who are colour blind see the number 3.Slide10
Colour Blind Test #2
What do you see?
Those who a colour blind will not see a number, just dots.Slide11
What Our E
yes See versus What is Really There...
Look at the chart and try to SAY the COLOUR.
Your right brain tries to say the colour, but your left brain insists on reading the word!Slide12
Optical Illusions
Exposes
a malfunction of the visual system
.
They bring out
particular good adaptations of our visual system to standard viewing situations. These adaptations are “hard-wired” in our brains, so under some artificial manipulations can cause inappropriate interpretations of the visual scene.Slide13
What Do You See?Slide14Slide15
Are the Lines Straight or Crooked?Slide16Slide17
Are the Wheels Spinning?Slide18
Can
you see 10 faces in the tree?Slide19
Which Centre Dot is Larger?Slide20
Some common illusions:Slide21
Which Line is the Longest?Slide22
Can you see the face?Slide23Slide24
What do you see?Slide25
Can
you see the kissing couple
?Slide26
Can you see
the three women?Slide27Slide28
How many Panda Bears do you see?Slide29
Does the Haze Seem to Shrink?Slide30
What Do You See?Slide31
What do you see?Slide32
How about now?Slide33
Stare at the image for 20 seconds, then look at the ceiling quickly...Slide34
What do you see?
A skull or a woman looking in a mirror?Slide35
The Magic Eye
In order to "see" the hidden image, two things must happen. First you must get one eye to look at a point in the image, while the other eye looks at the same point in the next pattern.
Second, you must hold your eyes in that position long enough for the
marvellous
structures in your brain to decode the 3D information that has been coded into the repeating patterns.Slide36
Can you see the image?Slide37
How about this one?