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A planet is observed by an astronomical ...

A planet is observed by an astronomical reflecting telescope having an objective of focal length 16 m and eyepiece of focal length 2 cm

A

the distance between the objective and eyepiece is 16.02 m

B

the angular magnification of the planet is 800

C

the image of the planet is inverted

D

the objective is larger than eyepiece

Text Solution

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The correct Answer is:
A, B, C, D
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A small astronomical telescope has an objective of focal length 50 cm and an eyepiece of focal length 5 cm . It is focussed at the sun and the final image is formed at a distance of 25 cm from the eyepiece . If the diameter of the sun subtends an angle of 32' at the centre of the objective calculate the angular magnification of the instrument and the actual size of the image.

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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

  • In an astronomical telescope , focal length of the objective is made

    A
    half that of the eyepiece
    B
    equal to the eyepiece
    C
    shorter than that of the eyepiece
    D
    greater than that of the eyepiece

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    A
    320
    B
    280
    C
    220
    D
    110

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