When a ray of light is incident normally on an air- glass interface, its angle of refraction is? By: Sunday|Published on: Aug 29|Categories: Physics WAEC| 0 comments A. 0° B. 42° C. 45° D. 60° E. 90° Correct Answer: Option A – 0° Users Also Read These:A ray of light is incident at an angle of 30°on a…The angle of deviation of light of various colours…A ray of light is incident on a plane mirror at an…When a ray of light is incident normally on an…A ray of light incident at an angle θ in a…SEE ALSO A radioactive substance of mass 768g has a half-life of 3 years. After how many years does this substance leave only 6g undecayed?