| Properties of Light | Reflection | Refraction | Colour | The Eye and Sight |
|---|---|---|---|---|
|
It travels in a straight line, it's reflected and it's refracted
What are the 3 characteristics of light?
|
He change in direction of a light ray when it hits the surface of an object
What is light reflection?
|
The change of direction in light rays when they pass from one medium to another
What is light refraction?
|
red, green and blue
What are the 3 primary colours of light?
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Light enters the eye through the cornea
Where does light enter the eye?
|
|
Penumbra
What is formed when light is partially blocked by an obstacle?
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The angle of incidence = the angle of reflection and all rays are in the same plane
What is one basic law of light reflection?
|
All rays and the normal are in the same plane OR when light rays move from fast to slow, it moves closer to the normal, and when light rays move from slow to fast mediums, it moves farther away from the normal
What is one law of refraction?
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Example: Paper, because some light can travel through them, but the light is sent in different directions
What is an example of a translucent object? Why?
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the iris
Which part of the eye regulates the amount of light that passes through the pupil?
|
|
The Moon moves between the Sun and the Earth
What is a solar eclipse?
|
Virtual
Images formed in plane (flat) mirrors are __________
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The index of refraction (n)
What is the relationship between the speed of light in a vacuum and its speed in a transparent medium called?
|
transparent
The color of a ____________________ object depends on which colours it transmits and absorbs. Example: A piece of glass is red when it absorbs all other colors EXCEPT red
|
the retina
Where is light focused inside the eye?
|
|
The Earth moves between the Sun and the Moon.
What is a lunar eclipse?
|
Draw a concave and convex mirror to show the difference between them
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It is broken down into the colours of the rainbow
What happens to white light when it passes through a prism?
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It´s an opaque object, so it´s yellow because it only reflects the colour yellow.
Why is a banana yellow? What type of object is it?
|
An upside down image
What type of image does the retina receive?
|
|
Bigger
During a lunar eclipse, the areas of shadow and penumbra on the moon are _______________ than the Moon's diameter
|
How can we use a periscope to see over a high wall?
|
The rays are refracted when they move from the water to the air
When a straw or stick is in water, why does it appear to be bent in two?
|
Purple or magenta
If you look at a blue object through a red filter, what colour will you see?
|
Through the optic nerve
How does light travel from the retina to the brain?
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