Explain the science behind the seen of object to the human eye, the light wave behavior and the light phenomena

1. Colours In Materials
Industrial Information technology
Group -03
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2. What Is Light ?
Light is simply a name for a range of
electromagnetic radiation that can be
detected by the human eye.
Electromagnetic radiation has a dual nature as
both particles and waves.
Brightness and Colour of the light are
depend on amplitude and wavelength in
electromagnetic wave.
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3. Visible Spectrum
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4. Mechanical waves
Langitiudinal waves  Transverse waves
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5. The Role of Light to Sight
 The object is absorbing
all the other colors of
light except the ones we
see, which are reflected
back to our eyes
 Human eyes contain
sets of cells that
recognize color
spectrum range of 400-
750 nm.
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6. Light phenomena
reflection refraction
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7. Reflection
 Is a light ray strikes a
smooth surface, such as a
mirror, and bounces off.
 This is happening according
to the low of Reflection.
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8. Total internal reflection
. The larger the angle to the
normal, the smaller is the
fraction of light transmitted,
until the angle when total
internal refraction (blue line)
occurs. (The color of the rays
is to help distinguish the rays,
and is not meant to indicate
any color dependence.)
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9. Diamond
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10. MIRAGE
• A mirage is a naturally
occurring optical
phenomenon in which
light rays are bent to
produce a displaced
image of distant objects
or the sky.
• 1.Inferior mirage
• 2.Highway mirage
• 3.Superior mirage
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12. Refraction
 Light rays bend at the
interface between two
dissimilar media and may be
curved in a medium in which
the refractive index changes.
 The angle of refraction, of the
light wave depends on how
much the material slows
down the light.
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13. A rainbow
 White light separates
into different Colours
on entering the
raindrop due to
dispersion, causing red
light to be refracted less
than blue light.
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14. Dispersion of Light by Prisms
 When the white light
go thoght the prism it
 Blue light refracts more
than red light to
deviate from is original
path by a greater angle
than the red light.
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15. Thank You
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