1 Light. 2 Visible Light Wavelengths range from 400 nm to 700 nm Longest wavelength = red Shortest...

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Transcript of 1 Light. 2 Visible Light Wavelengths range from 400 nm to 700 nm Longest wavelength = red Shortest...

Page 1: 1 Light. 2 Visible Light Wavelengths range from 400 nm to 700 nm Longest wavelength = red Shortest wavelength = violet 1 nm = 1 x 10 -9 m.

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Light

Page 2: 1 Light. 2 Visible Light Wavelengths range from 400 nm to 700 nm Longest wavelength = red Shortest wavelength = violet 1 nm = 1 x 10 -9 m.

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Visible Light Wavelengths range from

400 nm to 700 nm Longest wavelength = red Shortest wavelength =

violet 1 nm = 1 x 10-9 m

Page 3: 1 Light. 2 Visible Light Wavelengths range from 400 nm to 700 nm Longest wavelength = red Shortest wavelength = violet 1 nm = 1 x 10 -9 m.

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Speed of Light

Light does not require a medium The speed of light depends on

the medium The more dense the material,

the slower the light Light travels fastest in a vacuum

(no medium)

Page 4: 1 Light. 2 Visible Light Wavelengths range from 400 nm to 700 nm Longest wavelength = red Shortest wavelength = violet 1 nm = 1 x 10 -9 m.

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Speed of Light Speed of light in a vacuum = 3.00 x 108 m/s Speed of light first calculated

by Albert Michelson The symbol, c, is used to

represent the speed of light in a vacuum

Page 5: 1 Light. 2 Visible Light Wavelengths range from 400 nm to 700 nm Longest wavelength = red Shortest wavelength = violet 1 nm = 1 x 10 -9 m.

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Sources of light

Luminous object – gives off light

Illuminated object – reflects light

Page 6: 1 Light. 2 Visible Light Wavelengths range from 400 nm to 700 nm Longest wavelength = red Shortest wavelength = violet 1 nm = 1 x 10 -9 m.

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Opaque materials do not allow light to pass through them; they only absorb and reflect light

Page 7: 1 Light. 2 Visible Light Wavelengths range from 400 nm to 700 nm Longest wavelength = red Shortest wavelength = violet 1 nm = 1 x 10 -9 m.

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Transparent materials allow almost all light to pass through them; only a little light is absorbed and reflected

Page 8: 1 Light. 2 Visible Light Wavelengths range from 400 nm to 700 nm Longest wavelength = red Shortest wavelength = violet 1 nm = 1 x 10 -9 m.

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Some light passes through translucent materials, but the image is distorted.

Page 9: 1 Light. 2 Visible Light Wavelengths range from 400 nm to 700 nm Longest wavelength = red Shortest wavelength = violet 1 nm = 1 x 10 -9 m.

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Light and Color Colors – determined by

wavelength(s) of light that an object reflects

Objects appear to be white when they reflect all colors of visible light

Page 10: 1 Light. 2 Visible Light Wavelengths range from 400 nm to 700 nm Longest wavelength = red Shortest wavelength = violet 1 nm = 1 x 10 -9 m.

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Light and Color Objects appear to be black

when they absorb, rather than reflect, all colors of visible light

Filter – transparent material that absorbs all colors except the color or colors it transmits

Page 11: 1 Light. 2 Visible Light Wavelengths range from 400 nm to 700 nm Longest wavelength = red Shortest wavelength = violet 1 nm = 1 x 10 -9 m.

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Mixing colors

Pigment – colored material that absorbs some colors and reflects others

Page 12: 1 Light. 2 Visible Light Wavelengths range from 400 nm to 700 nm Longest wavelength = red Shortest wavelength = violet 1 nm = 1 x 10 -9 m.

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Colors (Light)

Primary colors of light are additive colors – combine to form white

Primary colors of light – red, green, and blue

Secondary Colors of light - magenta, cyan, and yellow

Page 13: 1 Light. 2 Visible Light Wavelengths range from 400 nm to 700 nm Longest wavelength = red Shortest wavelength = violet 1 nm = 1 x 10 -9 m.

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Page 14: 1 Light. 2 Visible Light Wavelengths range from 400 nm to 700 nm Longest wavelength = red Shortest wavelength = violet 1 nm = 1 x 10 -9 m.

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Pigments Primary colors of pigments

are subtractive colors – combine to form black, the absence of reflected light

Primary colors of pigment – magenta, cyan, and yellow

Secondary colors - red, green, and blue

Page 15: 1 Light. 2 Visible Light Wavelengths range from 400 nm to 700 nm Longest wavelength = red Shortest wavelength = violet 1 nm = 1 x 10 -9 m.

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Page 16: 1 Light. 2 Visible Light Wavelengths range from 400 nm to 700 nm Longest wavelength = red Shortest wavelength = violet 1 nm = 1 x 10 -9 m.

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Complementary Colors

One primary color and one secondary color that, when mixed, produce white light (White light is the combination of

all possible wavelengths of light) One primary pigment and one

secondary pigment that, when mixed, produce black

Page 17: 1 Light. 2 Visible Light Wavelengths range from 400 nm to 700 nm Longest wavelength = red Shortest wavelength = violet 1 nm = 1 x 10 -9 m.

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Light Pigment

Page 18: 1 Light. 2 Visible Light Wavelengths range from 400 nm to 700 nm Longest wavelength = red Shortest wavelength = violet 1 nm = 1 x 10 -9 m.

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The eye Sclera – white part Cornea – clear refractive surface Iris – colored part of eye (controls

how much light enters the eye) Pupil – hole through which light

passes Optic nerve – bundle of nerves at

the back of the eye relaying messages to the brain.

Page 19: 1 Light. 2 Visible Light Wavelengths range from 400 nm to 700 nm Longest wavelength = red Shortest wavelength = violet 1 nm = 1 x 10 -9 m.

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Retina – made up of two types of cells that absorb light Cones – distinguish colors and detailed shapes; most effective in daytime vision

Rods – sensitive to dim light; most effective in nighttime vision

Page 20: 1 Light. 2 Visible Light Wavelengths range from 400 nm to 700 nm Longest wavelength = red Shortest wavelength = violet 1 nm = 1 x 10 -9 m.

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Page 21: 1 Light. 2 Visible Light Wavelengths range from 400 nm to 700 nm Longest wavelength = red Shortest wavelength = violet 1 nm = 1 x 10 -9 m.

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Polarized light Light waves vibrate in only

one direction after passing through a polarizing filter


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