Optics Question 415

Question: The focal lengths of the lenses of an astronomical telescope are 50 cm and 5 cm. The length of the telescope when the image is formed at the least distance of distinct vision is

[EAMCET (Engg.) 2000]

Options:

A) 45cm

B) 55cm

C) 2756cm

D) 3256cm

Show Answer

Answer:

Correct Answer: D

Solution:

Length of the telescope when final image is formed at least distance of distinct vision is L=fo+ue=fo+feDfe+D

=50+5×255+25=3256cm



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