Arrange the values of the refractive index of the following in the decreasing order.
A. Water
B. Diamond
C. Dense flint glass
D. Crown glass
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → B, C, D, A
The refractive index n = c/v measures how much light slows down in a medium: the larger n, the optically denser the medium. Typical values:
\( \text{(B) Diamond: } 2.42 \)
\( \text{(C) Dense flint glass: } 1.62 \)
\( \text{(D) Crown glass: } 1.52 \)
\( \text{(A) Water: } 1.33 \)
So the decreasing order is (B), (C), (D), (A).
NCERT (2026-27):
Total Internal Reflection – …
