Question

a ray of light travelling in air strikes perpendicularly on the surface of glass slab.what is the magnitude of
i.angle of incidence?
ii.angle of refraction?
will the ray of light suffer any refraction?

Answer 1

zero because it strikes it normally which means. angle of incidence is 0 so refraction will also be zero and it will pass undeviatedly

Answer 2

here is your answer with diagram