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What is the function of the circular sto...

What is the function of the circular stop at the focal plane of the objective of a telescope? Givereasons.

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The aperture and focal length of the objective of telescope are large, why?

why should objective of a telescope have larger focal length ?

Knowledge Check

  • Consider the following statements about a microscope and a telescope 1. Both the eyepiece and the objective of a microscope are convex lenses. 2. The focal length of the objective of a telescope is lerger than the focal length of its eyepiece. 3. The magnification of a telescope increases with the increases in focal length of its objective. 4. The magnification of a microscope increases with the increases in focal length of its objective. Which of the statements given above are correct?

    A
    a 1 and 3 only
    B
    b 1 and 4
    C
    c 2, 3, and 4
    D
    d 1,2 and 3

  • The magnifying power of terrestrial telescope is 25 when it is in normal adjustment and the length of the telescope is 124 cm. If the focal length of the erecting lens is 5 cm, the focal lengths of the objective and the eye-piece are respectively.

    A
    ) 50 cm, 2 cm
    B
    50 cm, 2.5 cm
    C
    100 cm, 4 cm
    D
    100 cm, 5 cm

  • Assertion : If objective and eye lenses of a microscope are interchanged then it can work as telescope. Reason : The objective of telescope has small focal length.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
    C
    If assertion is true but reason is false.
    D
    If assertion and reason both are false.

    • Similar Questions

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    On seeing with unaided eye, the visual angle of moon at the eye is 0.6^(@) . The focal lengths of the objective and the eyepiece of a telescope are respectively 200 cm and 5 cm. What will the visual angle on seeing through the telescope?

    A small telescope has an objective lens of focal length 144 cm and an eyepiece of focal length 6.0 cm. What is the magnifying power of the telescope? What is the separation between the objective and the eyepiece?

    An astronomical telescope has an angular magnification of magnitude 5 for distant objects. The separation between the objective and an eye piece is cm and the final image is formed at infinity. Calculate the focal length of the objective and the focal length of the eye piece?

    An astronomical telescope under normal adjustment produces a magnification of 50 . If the objective has the focal length of 1 m , find the focal length of the eyepiece and the length of the telescope .

    An astronomical telescope arranged for normal adjustment has a magnification of 6. If the length of the telescope is 35cm, then the focal lengths of objective and euye piece respectivley =, are

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