Optics Question 409

Question: The focal length of objective and eye-piece of a telescope are 100 cm and 5 cm respectively. Final image is formed at least distance of distinct vision. The magnification of telescope is

[RPET 1997]

Options:

A) 20

B) 24

C) 30

D) 36

Show Answer

Answer:

Correct Answer: B

Solution:

$ |m|\ =\frac{f _{o}}{f _{e}}( 1+\frac{f _{e}}{D} )=\frac{100}{5}( 1+\frac{5}{25} )=24 $



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