Tools for Observation

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Tools for Observation
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Human Eye

• CORNEA - The transparent front part of the eye
  that covers the iris, pupil, and anterior
  chamber. The cornea is an essential part of the
  focusing in your eye.
• PUPIL - The variable-sized, black circular or
  slit shaped opening in the center of the iris
  that regulates the amount of light that enters
  the eye.
• LENS - A transparent, biconvex (lentil-shaped)
  structure in the eye that, along with the cornea,
  helps to reflect light to be focused on the
  retina.
• RETINA - A thin layer of neural cells that lines
  the back of the eyeball. It is comparable to the
  film in a camera
• OPTIC NERVE - The nerve that transmits visual
  information from the retina to the brain.
• Source www.wikipedia.com

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• The retina
• Rods detect light and dark
• A cones detects either Red, Blue, or green
• Cones concentrated at the center
• Rods at outside of eye

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Cone sensitivity
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Ha, Ha! Visible Spectrum of Light!!!
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Humans have developed tools to see things better.

• Galilean Telescope

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Camera

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Space Telescopes

• Hubble Space Telescope (HST)

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Trapezium (Orion nebula) Hubble Space Telescope
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Telescope, Cassini Moon
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Yellow filter, digital camera, 6 telescope Sun
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Mars as seen by HST
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Star forming region in the Large Magellanic Cloud
(LMC) from HST
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Film camera, 800mm lens Comet Swan
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HST, M31 (Andromeda galaxy)
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Bullet Nebula (HST Chandra X ray)

• Is this a true color image?
• Why was this image taken as an X ray photo?

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