Question

When a ray of light strikes the glass slab at ${90}^{\circ }$, it is seen that it does not deviate from its path. In such a situation :

• A. angle of incidence is zero
• B. angle of refraction is zero
• C. both(a) and (b)
• D. none of these

Answer 1

The correct option is C both(a) and (b)

If the rays of light are incident upon the glass surface perpendicularly, or at 90 degree angle to the surface, the rays will pass through without changing direction. In this case, the angle of incidence and angle of refraction are always zero.
Hence, the option A and B are correct.