A ray of light travelling in a transparent medium falls on a surface separating the medium from air

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A ray of light travelling in a transparent medium falls on a surface separating the medium from air, at an angle of incidence of 45^∘. The ray undergoes total internal reflection. If u is the refractive index of the medium with respect to air, select the possible values of u from the following.
17
Nov
A ray of light travelling in a transparent medium falls on a surface separating the medium from air, at an angle of incidence of 45^∘. The ray undergoes total internal reflection. If u is the refractive index of the medium with respect to air, select the possible values of u from the following. A ray [...]
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Tags: A ray of light travelling in a transparent medium falls on a surface separating the medium from air , at an angle of incidence of 45^∘. The ray undergoes total internal reflection. If u is the refractive index of the medium with respect to air , select the possible values of u from the following. ,