In an astronomical telescope in normal adjustment, a straight 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 the telescope is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Here we treat the line on the objective as the object and the eyepiece as the lens.
Hence 
and 
Now 
Solving we get 
Magnification 
∴ ∴ Magnification of telescope in normal adjustment
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