Vision

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Give some examples of visble of light??
flames, sun and burning candles
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Why are thibgs that do not emit light visble??
Light reflects them and bounces off them
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Light travels in what kind of lines??
Straight
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How can light chnge direction??
By being bent
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Light travels at different speeds through differnt materials. True of false??
True
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The bending of light is called??
Refraction
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What are two material are glasses usually made out off??
Plastic or glass
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What kind of surface do glasses have??
Curved
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What is another name for Convex lenses??
Converging
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What are convex lenses do to light??
Bring rays of light closer
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Where are convex lenses are found??
In the eye and are used in cameras
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what is a another name for conave lenses??
Diverging
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Are concave lenese thinner or thicker in the middle than at the outside
Thinner. Convex lenses are thicker in the middle than they are in the outside
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What do concave lenses do light rays??
Refract and bend light inwards-They make light rays spread out
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Where is the retnia located and what does it do to light rays??
The retina is located at the back of the eye and refracts the rays of the object
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Why does the brain turn the image the right way up??
Because the image is upside down when it enters the cornea
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What causes a blurred image image to be formed before the retina??
When some people lens are too stong
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What do we call this??
Short sighted
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What lense can it be corrected with??
Concave
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How does long sighted occur??
Whwn the eye lens is too weak to converge the light
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Why does this cause a blurred image??
As the light rays are brought to a focus behind the retina
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What lense fixes this eye condition??
Convex
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What function does the cornea perform??
It covers the front of the eye and is designed to refract light as it enters the eye
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What function does the Pupil perform??
It is a hole in the middle of the Iris and allows light to pass through and enter the eye.
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What function does Lens perfrom
It is a see-through disc, like a glasses lens, found just behind the Iris and pupil. It refracts the light onto the retina
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What function does the Retina perform
It is placed at the back of the eye and is made up of cells that are sensitive to light and colours, it also triggers electrical impulses that are sent to the brain, by the optic nerve. The retina is made up of cone shaped sensory cells.
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Other cards in this set

Card 2

Front

Why are thibgs that do not emit light visble??

Back

Light reflects them and bounces off them

Card 3

Front

Light travels in what kind of lines??

Back

Preview of the front of card 3

Card 4

Front

How can light chnge direction??

Back

Preview of the front of card 4

Card 5

Front

Light travels at different speeds through differnt materials. True of false??

Back

Preview of the front of card 5
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