Question

Light incident on a surface at an angle of 45° undergoes diffused reflection. At what angle will it reflect?

Answer 1

Light will be reflected D.  at any angle between -90° and 90°

Explanation:

Reflection is a phenomenon that occurs when a wave hits the boundary between two mediums and it is reflected back into the original medium.

According to the law of reflection:

• The incident ray, the reflected ray and the normal to the boundary all lie in the same plane
• The angle of reflection (the angle between the reflected ray and the normal to the boundary) is equal to the angle of incidence (the angle between the incident ray and the normal to the boundary)

There are two types of reflection:

• Specular reflection: this occurs when the boundary is perfectly smooth and there are no bumps (for example, in a mirror). In this case, all the incident rays coming from the same direction are reflected exactly at the same angle, and therefore a perfect image of the original object is formed
• Diffuse reflection: this occurs when the boundary is not smooth, so it has bumps. Because of that, each incident ray actually hits the boundary at a different angle of incidence, and therefore, the angle of reflection of each ray is different. Therefore, the reflected rays are all scattered at different angles, and no clear image is formed

In this problem, we have diffuse reflection: this means that the reflected ray will be scattered at different angles, therefore the correct answer is

D.  at any angle between -90° and 90°

Learn more about reflection and other wave phenomena:

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Answer 2

Answer: THIS ANSWER IS B