Transcript Slide 1 - My CCSD

Compare refracting and reflecting telescopes.
Have you ever bent or slowed down light? How?
Telescopes
• Telescope
• An instrument that
collects electromagnetic
radiation from the sky
and concentrates it for
better observation
– Optical telescopes
– Nonoptical telescopes
• Optical Telescopes
• Collects visible light and
focuses it for
observation
• Most have two lenses
– Objective lens: collects
light and forms an image
– Eyepiece: magnifies the
image
• Refracting Telescopes
• A telescope that uses a
set of lenses to gather
and focus light from a
distant object
• Refract = bend
• Negative:
– Images cannot be
perfectly focused
– If lens is too big it
distorts image
• Reflecting telescope
• A telescope that uses a
curved mirror to gather
and focus light from
distant objects
• Reflect = bounce back
• Positive:
– Large mirrors can collect
more light
– Flaws in glass do not affect
light
– Mirrors can focus all light
perfectly
• Linking Reflecting
Telescopes
• Can link two or more
large telescopes to see
further into space
• Atmosphere
• Air, moisture, light
pollution can cause
image to blur and
shimmer
• Best place to have a
telescope!
• Space
Telescopes
Telescopes

Saturn Aurora

Supernova
• Eagle Nebula (full)

Crab Nebula

Star Cluster

Galaxy Collision
Electromagnetic spectrum
• All the frequencies or
wavelengths of energy
• Nonoptical Telescopes
• Detect radiation that
cannot be seen by the
human eye
• Most electromagnetic
waves are blocked by
our atmosphere, so
most nonoptical
telescopes are placed in
space
Radio Telescope
Radio Telescope
Infrared Telescope
Infrared Telescope
X Ray Telescope
X Ray Telescope
Gamma Ray Telescope
Gamma Ray Telescope
Awesome! Now, fill in the rest of
these boxes with examples of the
EMS. Use page 561 in the Red Book
for help 
New Mexico
Green Bank Telescope (West Virginia)
Arecibo Telescope, Puerto Rico
Radio
X-RayWaves
Sun in Ultraviolet Light
Compare refracting and reflecting telescopes.
Why is having a telescope in space better than having one on Earth?