Question

What will be the angle of refraction when the refracted ray passes along the surface of water or any other denser medium ?

• A. ${30}^{\circ }$
• B. ${90}^{\circ }$
• C. ${45}^{\circ }$
• D. ${60}^{\circ }$

Answer 1

The correct option is B ${90}^{\circ }$

When the angle of incidence is equal to the critical angle, then then the angle of refraction is ${90}^{\circ }$. In this case, the ray gazes through the boundary of denser and rarer medium.