Question

the critical angle of glass is 45 . its refractive index is...........?

Answer 1

Answer:

I think 90

45 ×45 =90

please try to understand

Answer 2

from the relationship between critical angle and reflective index

n=1/sin c

angle=45°

then

refrective index,n= 1/sin45

sin45°= 1/√2

then n= 1/1/√2

and n=√2.