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 $
