# Q 9.29 (a)  For the telescope described in Exercise 9.28 (a), what is the separation between the objective lens and the eyepiece?

P Pankaj Sanodiya

a) Given,

focal length of the objective lens = $f_{objective}$= 140cm

focal length of the eyepiece lens = $f_{eyepiece}$ = 5 cm

The separation between the objective lens and eyepiece lens is given by:

$f_{eyepiece}+f_{objective}=140+5=145cm$

Hence, under normal adjustment separation between two lenses of the telescope is 145 cm.

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