
To Rank: The given mediums as per their refractive index from greatest to least.

Explanation of Solution
Introduction:
When light passes from one medium to another, it changes the direction of propagation. It turns towards the direction of the normal when it passes from a rarer medium to a denser one, whereas when it passes from denser medium to rarer one, it turns in the direction away from the normal.
As there is no deflection of path of light ray in medium A, it means it has the same refractive index as the air. In medium C, the angle of refraction is smallest. This means it is most dense medium out of all 4. The angle of refraction in case of medium D is smaller than that in case of medium B. This indicates that medium D is denser than medium B.
Conclusion:
Thus, as per refractive index, the rank of mediums is:
Chapter 18 Solutions
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