At what angle a ray of light strike the surface of glass so that it does not suffer any 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