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In an astronomical telescope , focal le...

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

Text Solution

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The correct Answer is:
The option D is correct .
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In an astronomical telescope , the focal length and the aperture of the objective are …… and the focal length and the aperture of the eyepiece are taken …… as compared to those of the objective [fill in the blank].

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Knowledge Check

  • In an astromical telescope , if the focal lengths of the objective and the eyepiece are f_o and f_e respectively , then the magnification of this instrument is almost

    A
    `(f_(o)+f_(e))`
    B
    `(f_(o) xxf_(e))`
    C
    `(f_o)/(f_e)`
    D
    `1/2(f_(o)+f_e)`

  • The angular magnification of an astronomical telescope will be maximum, if the focal lengths of the objective the eyepiece are respectively

    A
    1m and 5 cm
    B
    2 m and 6 cm
    C
    3 m and 4 cm
    D
    4m and 3 cm

  • 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

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    Is the length of the instrument to be changed if the focal length of the objective of an astronomical telescope is increased ?

    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.

    The final image is an astronomical telescope is …….and ……..with respect to the object [fill in the blank] .

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