Question

If a ray of light is incident normally on the glass slab, then angle of refraction will be :

• A. $0^0$
• B. ${45}^0$
• C. ${60}^0$
• D. ${90}^0$

Answer 1

The correct option is A $0^0$

If a ray of light is incident normally, angle of incidence will be zero as all angles are measured from normal.
As, $\angle i=\angle r$
so, if a ray of light is incident normally on the glass slab, then angle of refraction will be $0^0$ .
Hence, option A is correct.