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In an astronomical telescope in normal adjustment a straight black line of lenght 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 l. The magnification of the telescope is :
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L - 1 I
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L + I L - I -
L I -
L + l I
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Correct Option: C
Magnification by eye piece m = f/f + u
| - | = | = - | or, | = | |||||
| L | fe + I - (f0 + fe)I | f0 | L | f0 |
| Magnification, M = | = | ||
| fe | I |
