Question

солнечные лучи падают на землю под углом 40 градусов к её поверхности.Под каким углом к горизонту нужно расположить плоское зеркало,что бы направить отраженные от него лучи вертикально?

Answer 1

90+40=130 
180-130=50 
50/2=25 
40+25=65, отражающей поверхностью вниз, т. е. либо 65, либо минус 65, либо 180-65 115, в зависимости от выбора точки отсчета.

Answer 2

Calculation of the Angle of Reflection

To determine the angle at which a flat mirror should be positioned to reflect the incident rays vertically, we can use the law of reflection. According to the law of reflection, the angle of incidence is equal to the angle of reflection.

Given that the incident rays are falling on the Earth's surface at an angle of 40 degrees to the surface, we can use this information to calculate the angle of reflection.

The angle of incidence (θ_i) is 40 degrees, and the angle of reflection (θ_r) is the angle we need to find.

Using the law of reflection, we have:

θ_i = θ_r

Substituting the given value:

40 degrees = θ_r

Therefore, the flat mirror should be positioned at an angle of 40 degrees to the horizontal in order to reflect the incident rays vertically.

Please note that the sources provided did not directly answer the question. However, the law of reflection is a fundamental principle in optics and can be applied to solve this problem.