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Light & Sight (Sources & Reflectors (Absorption (When light hits a…
Light & Sight
Sources & Reflectors
Absorption
When light hits a substance they can be Absorbed. The light energy is transferred into heat energy increasing the object's temperature
Reflection
This is when light bounces off the surface of an object.
If the surface is smooth a sharp image will form.
If the surface is rough the light is scattered and no clear picture is formed.
Refraction
Light can be refracted.
This is when the light traveling through an object is bends on the borders of the surface.
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Sectra Through Prisms
Newton showed that a triangular glass prism can be used to split up white light (dispersion) into a spectrum of seven colours: ROYGBIV
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Colored Light
primary colors of light are red, green and blue
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Short & Far Sight
Sometimes our eyes don’t work properly, and we need a bit of help.
A long sighted person can see distant things clearly, but when looking at something nearby the image is blurred (because the lens can’t bend the light enough).
This can be corrected using a convex lens.
Other people can see things close up, but distant objects are blurred because the image is formed in front of the retina (often because of the way the eyeball grows).
Function
cornea
It functions like a window to moderate the amount of light.
pupil
To control the amount of light that is let into the eye
iris
Controls the diameters and the sizes of the pupil.
lens
To change the focal distance of the eye.
retina
To convert the light the the lens has received and convert it to nureal signs.
optic nerve
To transfer images to the vision center of the brain.
