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14. waves and sound — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics14. waves and sound1 Mark
MCQ
A light wave travels through three transparent materials of equal thickness. Rank in order, from the highest to lowest, the indices of refraction $n_1, n_2$ and $n_3$.
  • ✓
    $n_3 > n_1 > n_2$
  • B
    $n_1 < n_3 < n_2$
  • C
    $n_3 < n_1 > n_2$
  • D
    $n_2 > n_3 > n_1$
✓

Answer

Correct option: A.
$n_3 > n_1 > n_2$
a
${\lambda ^i} = \frac{\lambda }{n}$

${\lambda _2} > {\lambda _1} < {\lambda _3}$

${n_2} < {n_1} < {n_3}$

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