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Science · 2026 · 2 marks
CBSE 2026 · Region 5 · Set 2 · Q33
(a)Define absolute refractive index of an optical medium.(b)Material Medium Refractive Index A $\displaystyle 1.50$ B $\displaystyle 1.46$ C $\displaystyle 1.31$ D $\displaystyle 1.77$
Arrange these material mediums given in the table in increasing order of speed of light through them.
(a)
Define absolute refractive index of an optical medium.
(b)
Arrange these material mediums given in the table in increasing order of speed of light through them.
| Material Medium | Refractive Index |
| A | $\displaystyle 1.50$ |
| B | $\displaystyle 1.46$ |
| C | $\displaystyle 1.31$ |
| D | $\displaystyle 1.77$ |
Marking-scheme solution
(a)
Absolute refractive index of a medium is the ratio of speed of light in air to the speed of light in the given medium / Refractive index of a medium with respect to air /
\[\mathrm{n}=\frac{c}{v}
\]
(b)
\(\displaystyle \mathrm{V}_{\mathrm{D}}<\mathrm{V}_{\mathrm{A}}<\mathrm{V}_{\mathrm{B}}<\mathrm{V}_{\mathrm{C}}\)
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CBSE Class 10 Science past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.