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An astronomical refracting telescope wil...

An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens of

A

Large focal length and large diameter

B

Large focal length and small diameter

C

Small focal length and large diameter

D

Small focal length and small diameter

Text Solution

Verified by Experts

The correct Answer is:
A
Angular magnification = `(f_(0)/(f_(e)`
So, focal length of objective lens should be large for large angular magnification.
Angular resolution `((D)/(1.22lambda))`
So, objective should have large diameter (D) of objective lens for large resolution.
Hence option (a) is correct.
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Knowledge Check

  • An astronomical refracting telescope will be have large angular magnification and higher angular resolution, when it has an objective lens of

    A
    Large focal length and large diameter
    B
    Large focal length and small diameter
    C
    Small focal length and diameter
    D
    Small focal length and small diameter

  • An astronomical telescope has large apeture to

    A
    redurece spherical aberraion
    B
    have high resolution
    C
    increase span of observation
    D
    have low dispersion

  • An astronomical telescope has an angular magnification of magnitude 5 for distant object. The seperation between the objective and the eyepiece is 36 cm. and the final image is formed at infinity. The focal length f_(0) of the objective and the focal length f_(e) of the eyepiece are

    A
    `f_(0)=45cm, f_(e)=-9cm`
    B
    `f_(0)=7.2cm, f_(e)=5cm`
    C
    `f_(0)=50cm, f_(e)=10cm`
    D
    `f_(0)=30cm, f_(e)=6cm`

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