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Ray Optics and Optical Instruments — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsRay Optics and Optical Instruments1 Mark
Question
For the telescope described in, what is the separation between the objective lens and the eyepiece?
✓

Answer

Focal length of the objective lens$, f_0 = 140 \ cm$
Focal length of the eyepiece$, f_e = 5 \ cm$
In normal adjustment, the separation between the objective lens and the eyepiece
$= f_o + f_e $
$= 140 + 5 $
$= 145 \ cm$

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