Question

The diagram alongside shows the refraction of a ray of light from air to a liquid. Angle of incidence is :

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

Answer 1

The correct option is D ${60}^o$

Angle of incidence is the angle made between the incident ray and the normal. The angle between the incident ray and surface is ${30}^o$. Hence, angle between normal and incident ray will be 90-30=${60}^o$