Arrange the following in decreasing order of refractive indexes.

1. Water
2. Air
3. Ice

Select the correct answer using the codes given below.
a) 3 >1 > 2
b) 1 > 3 >2
c) 3 > 2 > 1
d) 1 > 2 > 3


Answer - b

Explanation– Water refractive index is 1.33, of ice is  1.31 and air is 1.