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Question: Answered & Verified by Expert
The magnifying power of a refracting type of astronomical telescope is ' $\mathrm{m}$ '. If focal length of eyepiece is doubled then the magnifying power will become
PhysicsRay OpticsMHT CETMHT CET 2021 (23 Sep Shift 2)
Options:
  • A $\mathrm{m}$
  • B $2 \mathrm{~m}$
  • C $\frac{\mathrm{m}}{2}$
  • D $\frac{\mathrm{m}}{4}$
Solution:
2579 Upvotes Verified Answer
The correct answer is: $\frac{\mathrm{m}}{2}$
Magnifying power, $m=\frac{f_o}{f_e}$
If $\mathrm{f}_{\mathrm{e}}$ is doubled, the magnifying power will become $\frac{\mathrm{m}}{2}$

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