physics xf: telescope

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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

    ss

    hh

    f

    fss

    o

    i

    o

    i

    oc

    ob

    oi

    M

    f

    111

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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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