Answer:
65.14°
Explanation:
The formula for the calculation of critical angle is:
[tex]{sin\theta_{critical}}=\frac {n_r}{n_i}[/tex]
Where,
[tex]{\theta_{critical}}[/tex] is the critical angle
[tex]n_r[/tex] is the refractive index of the refractive medium.
[tex]n_i[/tex] is the refractive index of the incident medium.
The light ray is travelling from glass to ethanol
Refractive medium is ethanol with refractive index = 1.361
Incident medium is glass with refractive index = 1.500
So,
Applying in the formula as:
[tex]{sin\theta_{critical}}=\frac {1.361}{1.500}[/tex]
The critical angle is = sin⁻¹ 0.9073 = 65.14°
