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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
An ice cube has a bubble inside. When viewed from one side the apparent distance of the bubble is $12\,cm$. when viewed from the opposite side, the apparent distance of the bubble is observed as $4\,cm$. If the side of the ice cube is $24\,cm$, the refractive index of the ice cube is $.....$.
  • A
    $\frac{4}{3}$
  • ✓
    $\frac{3}{2}$
  • C
    $\frac{2}{3}$
  • D
    $\frac{6}{5}$
✓

Answer

Correct option: B.
$\frac{3}{2}$
b
$d _{\text {appprent }}=\frac{ d _{\text {actual }}}{\mu_{\text {rel }}}$

$12=\frac{ x }{\mu}$

$4=\frac{24- x }{\mu}$

On solving we get $\mu=1.5$

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