The refractive index of a given transparent medium is 1.4. Which of the following is the minimum internal angle for total internal reflection to take place in the medium? by Sunday | Sep 2 | Physics WAEC | 0 comments A. 30° B. 36° C. 44° D. 46° E. 54° Correct Answer: Option D – 46° Users Also Read These:The critical angle for light travelling from a…A ray of light strikes a plane mirror at an angle of…A ray of light is incident on mirror m1 and after…A beam of light is incident from air to water at an…A ray of light travelling from glass into ethyl…