Carbon disulfide (n = 1.63) is poured into a container made of sodium chloride (n = 1.54). what is the critical angle for total internal reflection of a light ray in the liquid when it is incident on the liquid-to-glass surface?

70.87°

Explanation:

The formula for the critical angle is:

Where,  

is the critical angle

is the refractive index of the refractive medium.

is the refractive index of the incident medium.

n₁ is the refractive index for Carbon disulfide which is 1.63 (incident medium)  

n₂ is the refractive index of sodium chloride which is 1.54 (refractive medium)

Applying in the formula as:

The critical angle is = sin⁻¹ 0.9448 = 70.87°

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