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Geometrical Optics question

2014 · Q132
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Geometrical Optics question

2014 · Q132

NEETPhysicsGeometrical OpticsMCQ+4 / −1
If the focal length of objective lens is increased then magnifying power of
  1. A
    microscope will increase but that of telescope decrease.
  2. B
    microscope and telescope both will increase.
  3. C
    microscope and telescope both will decrease.
  4. D
    microscope will decrease but that of telescope will increase.
View written solutionFree

Correct answer: D

Magnifying power of microscope

m = (Lf0)(Dfe)\left( {{L \over {{f_0}}}} \right)\left( {{D \over {{f_e}}}} \right)(f0​L​)(fe​D​)

So if fo increases, then m will decrease.

Magnifying power of telescope, m = (f0fe)\left( {{{{f_0}} \over {{f_e}}}} \right)(fe​f0​​)

So if fo increases, then m will increase.

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