Question

The angle being measured from a plane and which is equal to angle between the beam of rays and normal to the plane is called __________

(a) Incident angle

(b) Azimuth angle

(c) Hour angle

(d) Declination

The question was asked in an international level competition.

Query is from Solar Radiation Measurement topic in section Solar Energy of Energy Engineering

Answer 1

Correct choice is (a) Incident angle

The explanation: The angle being measured from a plane and which is equal to angle between the beam of rays and normal to the plane is called as incident angle. And it is denoted by Greek letter θ (Theta). The angle of incidence (θ) is the angle between the sun’s rays irradiated on a surface and the line normal to this surface.