Arrange the following media according to the values of their refractive indices in increasing order.
(A) Water
(B) Diamond
(C) Dense flint glass
(D) Air
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → (D), (A), (C), (B)
The refractive index of a medium is \( n = c/v \); the more the medium slows light down, the larger its refractive index. Typical values:
\( \text{(D) Air: } n \approx 1.0003 \)
\( \text{(A) Water: } n \approx 1.33 \)
\( \text{(C) Dense flint glass: } n \approx 1.62 \)
\( \text{(B) Diamond: } n \approx 2.42 \)
Increasing order: (D), (A), (C), (B).
NCERT (2026-27):
Total Internal Reflection – …
