Arrange the following substances/media in the increasing order of their refractive indices.
A. Crown glass
B. Water
C. Diamond
D. CO2
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → D, B, A, C
Approximate refractive indices:
\( \text{CO}_2 \text{ (D)}: 1.0005 \)
\( \text{Water (B)}: 1.33 \)
\( \text{Crown glass (A)}: 1.52 \)
\( \text{Diamond (C)}: 2.42 \)
Increasing order: CO2 < Water < Crown glass < Diamond, that is, D, B, A, C.
NCERT (2026-27):
Total Internal Reflection – …
