Answer:
0
Step-by-step explanation:
All angles in a triangle must add to 180 degrees
The angle will also be 40 degrees because the reflected ray has the same angle as the incident ray.
When light rays reflect off a surface, migrate from one transparent medium to another, or travel through a medium whose composition is constantly changing, they change direction.
The angle of the reflected ray is equal to the angle of the incident beam when reflected off a flat surface, according to the law of reflection. (By convention, all angles in geometrical optics are measured with respect to the surface's normal, i.e. a line perpendicular to the surface.)
The reflected ray always falls in the plane specified by the incident light and the surface normal. To comprehend the pictures formed by planar and curved mirrors, the law of reflection can be applied.
As per the question, the light ray hits a mirror at a 40-degree angle.
Thus, the angle will also be 40 degrees because the reflected ray has the same angle as the incident ray.
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