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The focal lengths of the lenses of an as...

The focal lengths of the lenses of an astronomical telescope are `50cm` and `5cm`. The length of the telescope when the image is formed at the least distance of distinct vision is

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The focal length of the objective of an astronomical telescope is 75 cm and that of the eye-piece is 5 cm. If the final image is formed at the least distance of distinct vision from the eye, calculate the magnify- ing power of the telescope.

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Knowledge Check

  • The focal length of the lensese of an astronomical telescope are 50 cm and 5 cm. The length of the telescope when the image is formed at the least distance of distinct vision is

    A
    `45 cm`
    B
    `55 cm`
    C
    `(275)/(6) cm`
    D
    `(325)/(6) cm`

  • The magnifying power of an astronomical telescope for normal adjustment is 10 and the length of the telescope is 110 cm. Find the magnifying power of the telescope when the image is formed at the least distance of distinct vision for normal eye

    A
    14
    B
    48
    C
    28
    D
    52

  • The focal length of objective and eye lens of a astronomical telescope are respectively 2m and 5 cm . Final image is formed at (i) least distance of distinct vision (ii) infinity. The magnifying power in both cases will be

    A
    `-48,-40`
    B
    `-40, -48`
    C
    `-40, 48`
    D
    `-48, 40`

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