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Science · 2026 · 2 marks
CBSE 2026 · Region 5 · Set 1 · Q33
(a) Relate the speed of light in the given medium with its optical density. (b) Using the information given in the table below, arrange the medium A,…
(a)
Relate the speed of light in the given medium with its optical density.
(b)
Using the information given in the table below, arrange the medium A, B and C in the ascending order of their optical density.
| Medium | Speed of light (m/s) |
| A | $\displaystyle 2.25 \times 10^{8}$ |
| B | $\displaystyle 2 \times 10^{8}$ |
| C | $\displaystyle 2.08 \times 10^{8}$ |
Marking-scheme solution
(a)
In optically rarer medium speed of light is more and in optically denser medium speed of light is less.
(b)
$\displaystyle \mathrm{A}<\mathrm{C}<\mathrm{B}$
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CBSE Class 10 Science past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.