Q158 / 160 · WBJEE 2011 · Physics

If the focal length of the eye piece of a telescope is doubled, its magnifying power \((\mathrm{m})\) will be

  • A
    \(2 \mathrm{~m}\)
  • B
    \(3 \mathrm{~m}\)
  • Correct answer
    C
    \(\frac{\mathrm{m}}{2}\)
  • D
    \(4 \mathrm{~m}\)

Solution

Hints: \(\mathrm{m}=\frac{-\mathrm{f}_0}{\mathrm{f}_{\mathrm{e}}}\) \(\mathrm{m}^{\prime}=\frac{\mathrm{m}}{2}\)

Hence, the correct answer is option: 'C'.

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