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Science · 2026 · 2 marks
CBSE 2026 · Region 3 · Set 1 · Q33
A ray of light enters into medium B from medium A as shown in the given figure :(a)Which one of these two media is optically denser than the other medium ? Justify your answer.(b)If the speed of light in medium A is $\displaystyle \mathrm{V}_{\mathrm{A}}$ and in medium B is $\displaystyle \mathrm{V}_{\mathrm{B}}$, then what is the refractive index of medium $\displaystyle \mathrm{B}$ with respect to medium A ?
A ray of light enters into medium B from medium A as shown in the given figure :
(a)
Which one of these two media is optically denser than the other medium ? Justify your answer.
(b)
If the speed of light in medium A is $\displaystyle \mathrm{V}_{\mathrm{A}}$ and in medium B is $\displaystyle \mathrm{V}_{\mathrm{B}}$, then what is the refractive index of medium $\displaystyle \mathrm{B}$ with respect to medium A ?
Marking-scheme solution
(a) Medium A is optically denser than B because light ray is going away from the normal NN'.
(b) \(\displaystyle \mathrm{n}_{\mathrm{BA}}=\frac{V_{A}}{V_{B}}\)
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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.