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NEET 2014
Exam
NEET
Year
2014
Subject
Physics
Chapter
Ray Optics

NEET 2014 · Physics · Ray Optics

It the focal length of objective lens is increased then magnifying...

It the focal length of objective lens is increased then magnifying power of:

Options

  1. Amicroscope will increase but that of telescope decrease
  2. Bmicroscope and telescope both will increase
  3. Cmicroscope and telescope both will decrease
  4. Dmicroscope will decrease but that of telescope will increase

Correct answer

D. microscope will decrease but that of telescope will increase

Step-by-step solution

M.P. of a microscope =(Lf0)(Dfe)= \left(\dfrac{L}{{f}_{0}}\right)\left(\dfrac{D}{{f}_{e}}\right)
If f0↑⇒{f}_{0} ↑ ⇒ M.P. of the microscope will decrease
M.P. of telescope =f0fe= \dfrac{{f}_{0}}{{f}_{e}}
If f0↑⇒M/O.{f}_{0} ↑ ⇒ M / O . of telescope will increase.
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