✓ Board-verified
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…
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.
(b)
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)
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) \[\begin{aligned}
& \mathrm{n}_{21}=\frac{\mathrm{n}_{2 \mathrm{a}}}{\mathrm{n}_{1 \mathrm{a}}} \\
& \frac{1 \cdot 33}{2 \cdot 42} \text { or } 0 \cdot 55
\end{aligned}
\]
All Light - Reflection and Refraction questions2023 question paperNCERT solutions: Light - Reflection and RefractionPractice Light - Reflection and Refraction →
More from Light - Reflection and Refraction
- With the help of above given ray diagram, calculate the angle of refraction. Given that the refractive index of Medium 2 with respect to Medium 1 is…2026
- A student wants to obtain an erect image of an object using a concave mirror of 10 cm focal length. What will be the distance of the object from…2023
- An object is kept at a distance of 1m from a lens of power+2D: (i) Identify the type of lens. (ii) Calculate its focal length and distance of the…2023
- If the absolute refractive indices of two media X and Y are 6/5 and 4/3 respectively, then the refractive index of Y with respect to X will be:2025
- A student wants to project the image of a candle flame on a screen 60 cm in front of a mirror by keeping the candle at a distance of 15 cm from its…2023
- An object is placed in front of a concave mirror of focal length 12 cm. If distance of the object from the pole of the mirror is 8 cm, then use…2024
- (i) "In refraction of light through a rectangular glass slab, the emergent ray is always parallel to the direction of the incident ray." Why? Explain…2025
- The above ray diagram is to show image formation by a reflecting telescope. Reflecting telescope revolutionized our way of looking into the sky.…2026
CBSE Class 10 Science past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.