how do we see objects?. the eye and the brain stare at the centre of the rotating spiral for about...
TRANSCRIPT
![Page 1: How do we see objects?. The Eye and the Brain Stare at the centre of the rotating spiral for about 20 seconds, then look at your teacher The Spiral](https://reader036.vdocument.in/reader036/viewer/2022083008/56649d195503460f949eeeeb/html5/thumbnails/1.jpg)
How do we see objects?
![Page 2: How do we see objects?. The Eye and the Brain Stare at the centre of the rotating spiral for about 20 seconds, then look at your teacher The Spiral](https://reader036.vdocument.in/reader036/viewer/2022083008/56649d195503460f949eeeeb/html5/thumbnails/2.jpg)
The Eye and the Brain
Stare at the centre of the rotating spiral for about 20 seconds, then look at your teacher
The Spiral Illusion
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Understanding Sight
The tip of the candle flame emits light in all directions
But we only see the light that enters our Eye-Brain
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Understanding Sight
We don’t see light that does not enter our eyes
![Page 5: How do we see objects?. The Eye and the Brain Stare at the centre of the rotating spiral for about 20 seconds, then look at your teacher The Spiral](https://reader036.vdocument.in/reader036/viewer/2022083008/56649d195503460f949eeeeb/html5/thumbnails/5.jpg)
Understanding Sight
We don’t see light directed away from our eyes unless it is reflected into our Eye-Brain by something
![Page 6: How do we see objects?. The Eye and the Brain Stare at the centre of the rotating spiral for about 20 seconds, then look at your teacher The Spiral](https://reader036.vdocument.in/reader036/viewer/2022083008/56649d195503460f949eeeeb/html5/thumbnails/6.jpg)
Understanding Sight
On diagrams in this unit, we will tend to ignore all light that does not enter our Eye-Brains
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Light Rays
The path light takes is called a ray
Diagrams that show how light moves from the object to the eye are called ray diagrams
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Light Rays
Can you see the Eye-Brain’s feet?
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Light Rays
Light travels in straight lines
Since no ray of light can go straight from the Eye-Brain’s feet into your eyes, you can’t see them
![Page 10: How do we see objects?. The Eye and the Brain Stare at the centre of the rotating spiral for about 20 seconds, then look at your teacher The Spiral](https://reader036.vdocument.in/reader036/viewer/2022083008/56649d195503460f949eeeeb/html5/thumbnails/10.jpg)
Light Rays
![Page 11: How do we see objects?. The Eye and the Brain Stare at the centre of the rotating spiral for about 20 seconds, then look at your teacher The Spiral](https://reader036.vdocument.in/reader036/viewer/2022083008/56649d195503460f949eeeeb/html5/thumbnails/11.jpg)
Ray Diagrams
Luminous objects emit light rays in all directions
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Ray Diagrams
Non-Luminous objects scatter the light rays from luminous objects in all directions
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Ray Diagrams
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Ray Diagrams
To make things simpler, we only show the rays coming from the top of the object
We always only show the light rays that enter the observer’s eye
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Opaque Medium
An opaque medium absorbs or scatters all the rays
A textbook is an opaque medium