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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
The wavelength of light in air and some other medium are respectively ${\lambda _a}$ and ${\lambda _m}.$ The refractive index of medium is
  • ✓
    ${\lambda _a}/{\lambda _m}$
  • B
    ${\lambda _m}/{\lambda _a}$
  • C
    ${\lambda _a} \times {\lambda _m}$
  • D
    None of these
✓

Answer

Correct option: A.
${\lambda _a}/{\lambda _m}$
a
( a)${\mu _m} = \frac{c}{v} = \frac{{n\,{\lambda _a}}}{{n\,{\lambda _m}}}$$ = \frac{{{\lambda _a}}}{{{\lambda _m}}}$

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