Ligh t Where does light come from? Our major light source: the Sun Where else does light come from? Sorting light sources Natural vs.
Man-made (artificial) Are these light sources? moon water mirror These items are not light sources, instead they are reflecting light from other sources. light
source How does light travel? Light rays travel in straight lines from the light source. When it hits an opaque object, some light is absorbed and the rest reflects off. If the object is transparent, light rays pass through it easily. If the object is translucent, some light can pass through, but the rest of the light will be reflected. How do we see? Light coming from, (or reflecting off)
objects enters the eye through the cornea then the pupil. It is focused clearly by the lens on to the retina. The light sensitive cells of the retina gather information about patterns of light and dark, colour and movement and send it through the optic nerve. How do we see? Information entering the brain
through the optic nerve, is then transmitted through more nerve pathways to the visual cortex. Here the patterns of light and dark, colour and movement are interpreted. The brain, based on past experience, can then understand what it sees. How do we see colour? light source
Light from most light sources looks white, but actually contains all the colours of the spectrum; also known as the rainbow. If an object looks blue, it is absorbing every colour except blue, which is reflecting off it and entering your eyes. If an object looks orange, it is absorbing every colour except
orange, which, again, is reflecting off and entering your eyes. If an object looks red... (You get the idea!) on off How does light reflect? Angle of incidence Angle of reflection
The angle of reflection is always equal to the angel of incidence. on off Light can only be reflected in straight
lines. How does light form shadows? light source light source Light rays travel in straight lines, radiating out from the light source. If rays are blocked by an opaque object a shadow forms where the light cannot reach. If the light source is moved closer to the object, more
light is blocked and a larger shadow is formed. How does sunlight cause shadows? 2pm The position of the Sun effects 3pm the position and length of the 4pm shadows created. 7pm ...and travel
across the sky until it sets in the West. 12am 10am Looking North, the Sun appears to 9am rise in the East... 8am
6am Thanks to this natural phenomenon a sundial is able to tell us the time, as long as it is a Now explain to your partner: What is the Why does an Why does difference
rise does orange between lightlook a the SunHow in the East different a from the Sun and setperiscope in colour to a and light from
the West? banana? work? the moon? Why cant we see anything without a light
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