For total internal reflection, ray of light has to pass through-

CONCEPT:

• Total internal reflection (TIR): Total internal reflection (TIR) occurs at the interface of two transparent medium when the ray of light travels from a denser medium to a rarer medium.
• The critical angle is the angle of incidence in the denser medium for which the angle of refraction in the rarer medium is 90°.

• Total internal reflection (TIR) of light is the reflection of light within the same medium when a ray of light is incident at the interface of two medium at an angle of incidence which is greater than the critical angle for the pair of media i.e. i > ic.

EXPLANATION:

From the above table we can see that, μglass > μwater > μair > μvaccume

• Therefore, total internal reflection (TIR) will occurs at the interface of water and air. 
• As, water has more refractive index than air therefore it is water is denser medium and air is rarer medium.