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Ray Optics — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsRay Optics1 Mark
MCQ
When the length of a microscope tube increases, its magnifying power
  • ✓
    (a) Decreases
  • B
    (b) Increases
  • C
    (c) Does not change
  • D
    (d) May decrease or increase
✓

Answer

Correct option: A.
(a) Decreases
(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 $L, u$ will increase and hence magnifying power $(m)$ will decrease.

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