Question

If the angle of incidence is equal to critical angle,then the angle of refractive is ( C ):

• A. $0^o$
• B. ${20}^o$
• C. ${90}^o$
• D. ${180}^o$

Answer 1

The correct option is C ${90}^o$

When the angle of incidence is equal to critical angle,then the angle of refraction is ${90}^0$. When a ray of light travels from more dense medium to less dense medium then total internal reflection takes place.