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Light, F19AC362-6626-4A5E-9301-0437AEC96AFA - Coggle Diagram
Light
Examples
Sun
Torch
Fire
Firefly
computer screen
Bulb
opaque objects
Light cannot pass through
Absorbs light
Creates shadows
Eg: Block of wood
Transparent objects
Light passes through completely
Does not create shadows
Does not absorb light at all
Eg. Clear glass,
shadows
colored shadows
The outer parts of the shadow - the outline of the shadow
we can see colored shadows when we shine three different colored on the same surface,we perceive it as white,but with these colors we can make different colors such as:
Cyan,magenta,yellow,black,red,blue,green.
Umbra
darker inner part of the shadow
Penumbra
lighter outer part of the shadow
Brightness of light
Light cannot pass through opaque objects
Light can slightly pass through translucent objects
Light can pass through completely in transparent objects
Translucent
Light passes through it partially.
Eg- Butter paper, frosted glass and a plastic sheet.
Human Eye
Retina
Contains light receptors called Rods and Cones
Cones let you see in color as long as its not very dark.
We have three types of cones
The three types of cones: blue, green, and red
when blue green and red lights are projected in the same place
our eye can only see white.
Rods are used for night vision. They only let you see in shades of grey.
We have only one Rod
Frequency of light
Human eyes can see light only between a certain range.
speed of light
Rectillinear propagation of light
pinhole camera
Discovered by Pierre de Fermat
299 792 458 m / s is the speed of light.
ECLIPSES
Solar eclipse
Total
Partial
Annular
Lunar eclipse
Total
Partial
Penumbral
LUNAR ECLIPSE
LUNAR ECLIPSE
A lunar eclipse occurs when the Moon moves into the Earth's shadow. This can occur only when the Sun, Earth, and Moon are exactly or very closely aligned, with Earth between the other two. A lunar eclipse can occur only on the night of a full moon.
Shadows 2
Get smaller when away from light source
Get bigger when close to light source
Types of light sources
luminous
The luminous objects are visible as they emit light on their own.The sun and are fire the two examples.
non-luminous
The non-luminous objects are visible because of luminous objects.The moon and plants are the two examples.
SOLAR ECLIPSE
An eclipse of the Sun happens when the New Moon moves between the Sun and Earth, blocking out the Sun's rays and casting a shadow on parts of Earth. A solar eclipse can only occur on the night of a new moon.
Light or visible light is electromagnetic radiation
