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Science · 2023 · 2 marks
CBSE 2023 · Region 6 · Set 1 · Q25
A light ray enters from medium A to medium B as shown in the figure.
(a)Which one of the two media is denser w.r.t. other medium ? Justify your answer.If the speed of light in medium A is $\displaystyle v_{\mathrm{a}}$ and in medium B is $\displaystyle v_{\mathrm{b}}$, what is the refractive index of B with respect to A.A ray of light starting from diamond is incident on the interface separating diamond and water. Draw a labelled ray diagram to show the refraction of light in this case.(b)Absolute refractive indices of diamond and water are $\displaystyle 2.42$ and $\displaystyle 1.33$ respectively. Find the value of refractive index of water w.r.t. diamond.
A light ray enters from medium A to medium B as shown in the figure.
(a)
Which one of the two media is denser w.r.t. other medium ? Justify your answer.
If the speed of light in medium A is $\displaystyle v_{\mathrm{a}}$ and in medium B is $\displaystyle v_{\mathrm{b}}$, what is the refractive index of B with respect to A.
A ray of light starting from diamond is incident on the interface separating diamond and water. Draw a labelled ray diagram to show the refraction of light in this case.
(b)
Absolute refractive indices of diamond and water are $\displaystyle 2.42$ and $\displaystyle 1.33$ respectively. Find the value of refractive index of water w.r.t. diamond.
Marking-scheme solution
(a) Medium B In medium B ray of light bends towards normal \(\displaystyle / \angle \mathrm{r}<\angle \mathrm{i}\)
(b) Refractive index of Medium 'B' with respect of Medium 'A' is
\[\mathrm{n}_{\mathrm{BA}}=\frac{\mathrm{v}_{\mathrm{a}}}{\mathrm{v}_{\mathrm{b}}}
\] OR
(a) 
(Credit marks for ∠ i , ∠ r and arrows.)
(Credit marks for ∠ i , ∠ r and arrows.)(b) \[\begin{aligned}
& \mathrm{n}_{21}=\frac{\mathrm{n}_{2 \mathrm{a}}}{\mathrm{n}_{1 \mathrm{a}}} \\
& \frac{1 \cdot 33}{2 \cdot 42} \text { or } 0 \cdot 55
\end{aligned}
\]
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CBSE Class 10 Science past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.