Answer:
a) 
b) 
c) 
d) 
Explanation:
Given:
- refractive index of liquid medium 1 (with respect to air),

- angle of incidence in medium 1,

- angle of refraction in medium 2,

(a)
<em>According to Snell's Law:</em>
<u>refractive index of medium 2 with respect to medium 1:</u>



(c)
Now the other form of Snell's law:
..............................(2)
where:
c = speed of light in air
n = refractive index of the medium with respect to air
v = speed of light in medium
<u>Using eq. (2) for medium 1:</u>


(d)
<u>Using eq. (2) for medium 2:</u>



(b)
<u>Now, refractive index of the medium 2 with respect to air</u>

