✓ Board-verified
Science · 2026 · 2 marks
CBSE 2026 · Region 5 · Set 2 · Q33
(a) Define absolute refractive index of an optical medium. (b) Arrange these material mediums given in the table in increasing order of speed of…
(a)
Define absolute refractive index of an optical medium.
(b)
Arrange these material mediums given in the table in increasing order of speed of light through them.
| Material Medium | Refractive Index |
| A | $\displaystyle 1.50$ |
| B | $\displaystyle 1.46$ |
| C | $\displaystyle 1.31$ |
| D | $\displaystyle 1.77$ |
Marking-scheme solution
(a)
Absolute refractive index of a medium is the ratio of speed of light in air to the speed of light in the given medium / Refractive index of a medium with respect to air /
\[\mathrm{n}=\frac{c}{v}
\]
(b)
\(\displaystyle \mathrm{V}_{\mathrm{D}}<\mathrm{V}_{\mathrm{A}}<\mathrm{V}_{\mathrm{B}}<\mathrm{V}_{\mathrm{C}}\)
All Light - Reflection and Refraction questions2026 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 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.