Answer:
28.42°
Explanation:
Critical Angle:This is the incident angle at which the angle of refraction is 90° when light passes from denser to less dense medium
from Refraction,
1/n = sinc......... Equation 1
Where n = refractive index of the liquid, c = critical angle.
make c the subject of the equation
c = sin⁻¹(1/n)............. Equation 2
Given: n = 2.1
Substitute the value of n into equation 2
c = sin⁻¹(1/2.1)
c = sin⁻¹(0.476)
c = 28.42°
Hence the critical angle = 28.42°
