# refractive index for water and glycerine are 1.33 and 1.47 respectively.what is critical angle for light ray going from later to former?

Arun
25763 Points
4 years ago
Dear Student

When ray passes through denser to rarer medium.
Angle of refraction is greater than angle of incidence.
When a ray of light passes from glycerine(denser) to water (rarer medium)
Then frim Snell's law-
sin i/sin r = $\mu$

Arun
25763 Points
4 years ago
Sin i/ sin r = $\mu$1 /$\mu$2
When r = 90°,
Angle of incidence is called critical angle.
i.e.,
i = $\theta$c

Then
$\theta$c = sin-1 (1.33/1.47)
$\theta$c = 64° 48'

Regards