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10. Wave optics — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics10. Wave optics1 Mark
MCQ
The separation between two microscopic particles is measured ${P_A}$ and ${P_B}$ by two different lights of wavelength $2000 \;\mathring A $ and $3000 \;\mathring A $ respectively, then
  • A
    ${P_A} > {P_B}$
  • ✓
    ${P_A} < {P_B}$
  • C
    ${P_A} < \frac{{3}}{{2}} {P_B}$
  • D
    ${P_A} = {P_B}$
✓

Answer

Correct option: B.
${P_A} < {P_B}$
b
Resolving limit (minimum separation)$ \propto \lambda $

$ \Rightarrow \frac{{{P_A}}}{{{P_B}}} = \frac{{2000}}{{3000}} \Rightarrow {P_A} < {P_B}$

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