Light - Reflection and Refraction
1.
A ray incident perpendicularly to the glass surface will not undergo any deviation.
2.
In reflection angle of incidence = angle of reflection
So, it is 15o.
If the angle of incident is90o then it doesnot suffer any refraction.
1. if the ray of light strikes at angle of 0 then the ray not suffer any reflection because of law of reflection anglei = angler
2. then also according to angle of reflection angle of reflection is also 15
sorry , but in first it is 90 not 0