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An astronomical telescope is adjusted to...

An astronomical telescope is adjusted to form the final image at infinity. The separation between the lenses is 80 cm . The angular magnification is 15 . Calculate the focal length of the eyepiece in cm.

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The lengths of the tube of an astronomical telescope is 44 cm and its angular magnification is 10 . What is the focal length of its objective ?

The length of the tube of an astronomical telescope is 80 cm and the magnifying power of the instrument is 19 . Calculate the focal lengths of the objective and the eyepiece.

Knowledge Check

  • An astronomical refractive telescope has an objective of focal length 20 m and an eyepiece of focal length 2 cm .

    A
    The length of the telescope tube is 20.02 m
    B
    The magnification is 1000
    C
    The image formed is inverted
    D
    An objective of a larger aperture will increases the brightness and reduce chromatic aberration of the image

  • A Galileo's telescope has an objective of focal length 100 cm and magnifying power 50. The distance between the two lenses in normal adjustment is

    A
    106 cm
    B
    102 cm
    C
    92 cm
    D
    98 cm

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    An object is placed at a distance of 5 cm from the objective of a compound microscope . If the final image is formed at the least distance of distinct vision and coincides with the object then calculate the focal lengths of the objective and the eyepiece . given that the least distance of distinct vision =25 cm and the magnifying power of the instrument = 15 cm.

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