physics xf: telescope
TRANSCRIPT
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TELESCOPE
Andre Anthony
Hansel Bunardi
Felicia Limenkoh
Fani Agusta Chandra
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HISTORY
1. First refracting telescope (1608)Hans Lippershey, Zacharias Janssen
and Jacob Metius
2. Galilean telescope (1609)
3. Keplerian telescope (1611)
4. And many more...
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HISTORY
5. Gregorian telescope(1663; model of reflecting telescope)
6. First reflecting telescope Newtonian telescope
(1668)
7. Cassegrain telescope (1672)
8. And many more...
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A tool
Function : to observe
objects closely and clearlywhen they are very far away
Objects : celestial objects& terrestrial objects
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TELESCOPE
()_
_
)(_
_
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(OBL) Lens which is placed near theobjects
MUST CONVEX LENS. Why?
Form real image at its focal point.
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OCULAR LENS (OCL)
Lens which is placed near the
eye
MAY BE CONVEX OR
CONCAVE lens
Enlarge the real image
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SO,Length of telescope
(distance between ObL n
OcL)
=Fob + Foc
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GALILEAN TELESCOPE
By Galileo Galilei
ObL : convex lens
OcL : concave lens
(+) : Upright (-) : Blurry, distorted
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KEPLERIAN TELESCOPE
By Johannes Kepler
ObL and OcL : convex lens
(+) : Rays are converging (more
focus), Wider field of view
(-) : inverted
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MAGNIFICATIONOf Refracting Telescope
=Fob____
Foc
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Simple design
Excellent for moon and planets
(planetary)
High contrast
Not good for Nebula and Galaxy
viewing (deep sky)
Heavier and longer than reflector
telescope
Chromatic aberration happens
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Chromatic Aberration
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TELESCOPE
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Gregorian telescop
l
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GREGORIAN TELESCOPE
By James Gregory
Upright image
For terrestrial observation
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NEWTONIAN TELESCOPE By Isaac Newton
Upside-down image
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CASSEGRAIN TELESCOPE
By Laurent Cassegrain
Upside-down image
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Low cost
Excellent for deep sky viewing
Good for planetary viewing
Bright image Light loss due to secondary
mirror
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FORMULA
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PROBLEM1. The focal length of two convex lenses is
10cm and 20cm (fob,foc). Both lenses are
seperated by 50cm. An object is in frontof the first lens that has an image in the
middle of both which is 31cm away from
the first lens.a. Find the object length of the first lens
b. Find the final magnification
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PROBLEM2. Two convex lens with the focal length 25cm
and 5cm are separated by 70cm. A candle
is placed 50 cm from the first lens. Theposition of the final image is...
3. What are the magnification and the
distance between both lens if the focallength of a galilean telescope are 20cm
and 4cm (obl,ocl) and the image form is at
infinity?
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Quiz Baby!
1. A space telescope (keplerian telescope) has focal length of objective
and ocular lens which are 50cm and 2cm consecutively. The
telescope will form an image at infinity. Determine :
a. The magnification of the telescope
b. The distance between both lenses
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Quiz Baby!
3.The focal length of the objective and ocular lens of a Keplerian
telescope are 20cm and 10cm consecutively. The distance
between both lenses is 40cm.
Find the image position of the convex lens of an object that is
placed 100cm in front of objective lens.
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