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Science · 2025 · 2 marks
Light - Reflection and RefractionRefraction of Light and Refractive Index2 marksApplyvery short answer
CBSE 2025 · Region 5 · Set 1 · Q24
The values of absolute refractive indices of kerosene and water are 1.44 and 1.33 respectively. Compare the two media on the basis of their (a)…
The values of absolute refractive indices of kerosene and water are $\displaystyle 1.44$ and $\displaystyle 1.33$ respectively. Compare the two media on the basis of their
(a)
optical density
(b)
mass density
(c)
relative speed of propagation of light. What do you infer on the basis of above comparisons ?
Marking-scheme solution
| Kerosene ($\displaystyle 1$•$\displaystyle 44$) | Water ($\displaystyle 1$•$\displaystyle 33$) |
| (a) Higher optical density | Lower optical density |
| (b) Lower mass density | Higher mass density |
| (c) Lower speed of light | Higher speed of light |
-Inference: Although, kerosene is optically denser than water but its mass density is less than water/ An optically denser medium may not possess greater mass density.
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CBSE Class 10 Science past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.