✓ Board-verified
Science · 2026 · 2 marks
CBSE 2026 · Region 5 · Set 1 · Q33
(a)Relate the speed of light in the given medium with its optical density.(b)Using the information given in the table below, arrange the medium A, B and C in the ascending order of their optical density. Medium Speed of light (m/s) A $\displaystyle 2.25 \times 10^{8}$ B $\displaystyle 2 \times 10^{8}$ C $\displaystyle 2.08 \times 10^{8}$
(a)
Relate the speed of light in the given medium with its optical density.
(b)
Using the information given in the table below, arrange the medium A, B and C in the ascending order of their optical density.
| Medium | Speed of light (m/s) |
| A | $\displaystyle 2.25 \times 10^{8}$ |
| B | $\displaystyle 2 \times 10^{8}$ |
| C | $\displaystyle 2.08 \times 10^{8}$ |
Marking-scheme solution
(a)
In optically rarer medium speed of light is more and in optically denser medium speed of light is less.
(b)
$\displaystyle \mathrm{A}<\mathrm{C}<\mathrm{B}$
More from Light - Reflection and Refraction
- If the absolute refractive indices of two media X and Y are 6/5 and 4/3 respectively, then the refractive…2025 · asked 3×
- (i) "In refraction of light through a rectangular glass slab, the emergent ray is always parallel to the…2025 · asked 3×
- The above ray diagram is to show image formation by a reflecting telescope. Reflecting telescope…2026 · asked 3×
- Draw ray diagrams to show the nature, position and relative size of the image formed by a convex mirror when…2025 · asked 3×
- A highly polished surface such as a mirror reflects most of the light falling on it. In our daily life we use…2024 · asked 3×
- Out of the two lenses, one concave and the other convex, state which one will diverge a parallel beam of…2025 · asked 3×
- The power of a lens is -0.25 D. Based on this information, find out The type of lens and its focal length.…2025 · asked 3×
- Study the data given below showing the focal length of three concave mirrors A, B and C and the respective…2024 · asked 3×
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.