Optics Question 418

Question: In a terrestrial telescope, the focal length of objective is 90 cm, of inverting lens is 5cm and of eye lens is 6cm. If the final image is at 30 cm, then the magnification will be

[DPMT 2001]

Options:

A) 21

B) 12

C) 18

D) 15

Show Answer

Answer:

Correct Answer: C

Solution:

m=fofe(1+feD)m=906(1+630)m=18



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