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  • A terrestrial telescope is made by introducing an erecting lens of focal length f between the objective and eye piece lenses of an astronomical telescope. This causes the length of the telescope tu

A terrestrial telescope is made by introducing an erecting lens of focal length f between the objective and eye piece lenses of an astronomical telescope. This causes the length of the telescope tube to increase by an amount equal to

Option: 1

f


Option: 2

2f


Option: 3

3f


Option: 4

4f


Answers (1)

best_answer

 

 

                                      

 

                                                        \begin{aligned} L=f_{o}+f_{e}+4 f \end{aligned}

Since the length of the astronomical telescope is \begin{aligned} L_{astronomical}=f_{o}+f_{e} \end{aligned}

So increase in the length is 4f

 

 

 

Posted by

Sanket Gandhi

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