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  4. The length of a telescope is 36 cm The focal lengths of its lenses can be

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Q. The length of a telescope is 36 cm The focal lengths of its lenses can be

Ray Optics and Optical Instruments

Solution:

Length of a telescope, $L=f_{o}+f_{e}=36\, \,cm$ and both the lenses are convex.
$\therefore f_{o}=30\, cm , f_{e}=6 \,cm$