The length of a telescope is 36 , cm. The foc | vedclass

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(A) For a normal adjustment of an astronomical telescope,the length of the tube $L$ is given by the sum of the focal lengths of the objective lens $(f

Vedclass · Accepted Answer

$30 \, cm, 6 \, cm$

Vedclass · Answer

(A) For a normal adjustment of an astronomical telescope,the length of the tube $L$ is given by the sum of the focal lengths of the objective lens $(f_o)$ and the eyepiece $(f_e)$.$L = f_o + f_e$Given $L = 36 \, cm$.Since an astronomical telescope uses two convex lenses,both focal lengths must be positive.Thus,$f_o + f_e = 36 \, cm$.Checking the options,$30 \, cm + 6 \, cm = 36 \, cm$.Therefore,the correct option is $A$.

The length of a telescope is $36 \, cm$. The focal lengths of its lenses can be

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