If the glancing angle of incidence is 30° , what will be the angle of incidence?

• A. 30°
• B. 60°
• C. 90°
• D. 150°

The angle of incidence is defined as the angle between the incoming ray and the normal (a line perpendicular to the surface at the point of incidence). When the glancing angle of incidence is given as 30°, it refers to the angle between the incoming ray and the surface itself.

Understanding the Relationship

To find the angle of incidence, you can use the following relationship:

• Angle of incidence = 90° - Glancing angle

Calculation

In this case:

• Angle of incidence = 90° - 30° = 60°

Final Answer

The angle of incidence is 60°, so the correct option is B. 60°.