According to the condition of the problem, there isa shiny metal surface.
Glitter occurs when specular reflection of light from
a surface occurs, for the most part occurring simultaneously
with diffuse reflection.
In the case of diffuse reflection, the reflection occurs at an angle
that differs from the incident one and does not necessarily lie in
the plane of the incident ray and the normal.
Answer: Some part of the light beam has a reflection
angle different from the angle of incidence.
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