Optics Question 421
Question: In an astronomical telescope, the focal length of objective lens and eye-piece are 150 cm and 6 cm respectively. In case when final image is formed at least distance of distinct vision. the magnifying power is
[KCET 2001]
Options:
A) 20
B) 30
C) 60
D) 15
Show Answer
Answer:
Correct Answer: B
Solution:
$ m=\frac{f _{o}}{f _{e}}( 1+\frac{f _{e}}{D} )=\frac{150}{6}( 1+\frac{6}{25} )=30 $ .
