CBSE 2023 · Region 2 · Set 1 · Q9 · 1 mark
A beam of light travels from air into a medium. Its speed and wavelength in the medium are $\displaystyle 1.5 \times 10^{8} \mathrm{~ms}^{-1}$ and $\displaystyle 230$ nm respectively. The wavelength of light in air will be
Official answer
From CBSE’s own marking scheme for this paper.
(C)
$\displaystyle 460$ nm
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CBSE Class 12 Physics past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.