CBSE 2026 · Region 1 · Set 1 · Q5 · 1 mark
An electromagnetic wave passes from vacuum into a dielectric medium with relative electrical permittivity ($\displaystyle 3$/$\displaystyle 2$) and relative magnetic permeability ($\displaystyle 8$/$\displaystyle 3$). Then, its
Official answer
From CBSE’s own marking scheme for this paper.
(C)
wavelength is halved and frequency remains unchanged.
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CBSE Class 12 Physics past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.