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 $ .



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