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In an astronomical telescope in normal a...

In an astronomical telescope in normal adjustment a straight black line of length `L` is drawn on inside part of objective lens. The eye piece forms a real image of this line. The length of this image is `I`. The magnification of the telescope is

A

`L/l`

B

`L/l+1`

C

`L/l-1`

D

`(L+l)/(L-l)`

Text Solution

Verified by Experts

The correct Answer is:
a
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Knowledge Check

  • The final image in an astronomical telescope adjustment, a straingt black line of length L is drawn on the objective lens. The eyepiece forms a real image of this line. The length of this image is l. The magnification of thed telescope is

    A
    virtual and erect
    B
    real and erect
    C
    real and inverted
    D
    virtual and inverted

  • When as tronomical telescope is adjusted for normal adjustment the finla image is formed at

    A
    infinity
    B
    D.D.V. from eye piece.
    C
    D.D.V from objective
    D
    focus of eye-piece.

  • In an astronomical telescope, the final image for normal vision is formed at

    A
    the focus of the eye piece
    B
    the least distance of the distinct vision
    C
    the focus of the objective lens
    D
    infinity

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