Question

if the refractive index of Glass with respect to air is 3/2, what is the refractive index of air with respect to glass?

opctions
1) 1/2. 2) 3. 3) 1/3. 4) 2/3

Answer 1

The refractive index of glass wrt air =velocity of light in air/velocity of light in glass
The refractive index of air wet to glass= velocity of light in glass/velocity of light in air
We can clearly see the below result
Refractive Index of glass wrt air =1/Refractive index of air wrt glass
Or, RI of air wrt glass =1/ RI of glass wrt air
=1/(3/2)= 2/3
Ans 4: 2/3

Answer 2

Here RI of glass with respect to air=3/2
RI of air with respect to glass=?
RI of ag=reverse of RIgr
=2/3