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9. Ray optics abd optical instruments — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics9. Ray optics abd optical instruments1 Mark
MCQ
When the length of a microscope tube increases, its magnifying power
  • ✓
    Decreases
  • B
    Increases
  • C
    Does not change
  • D
    May decrease or increase
✓

Answer

Correct option: A.
Decreases
a
(a) For a microscope $|m|\; = \frac{{{v_o}}}{{{u_o}}} \times \frac{D}{{{u_e}}}$ and $L = {v_o} + {u_e}$
For a given microscope, with increase in $L,$ $u_e$ will increase and hence magnifying power $(m)$ will decrease.

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