![]() ![]() The angles are measured relative to the perpendicular to the surface at the point where the ray strikes the surface. ![]() The images, I1 and I2, form exactly on the opposite side of each mirror, the same distance from the mirror, just as you would expect for reflection from a single mirror. Consider the two mirrors (solid lines) shown at right at an angle of 120 degrees to each other. The angles are measured relative to the perpendicular to the surface at the point where the ray strikes the surface. This minimum value of the angle of deviation is called angle of minimum deviation. The law of reflection states that the angle of reflection equals the angle of incidencer i. These multiple reflections can lead to multiple images. As the angle of incidence is increase the angle of deviation steadily decreases up to a certain minimum value of the angle of deviation. The two equations (33.41) and (33.42) give us that the angle of reflection is equal to the angle of incidence, as we expected. The angle between the direction of the incident ray and the direction of the emergent ray is called the angle of deviation.įor a given prism the value of the angle deviation depends on the value of the angle of incidence. When light rays pass from optically denser medium to optically rarer medium, the light rays bend away from the normal. When light rays pass from optically rarer medium to optically denser medium, the light rays bend towards the normal. The angle of incidence is always equal to the angle of reflection. Once while it enters the prism and again while it emerges from it. When a ray of light passes through a prism it suffers refraction twice. When a ray of light passes from one medium to another it changes its path, this phenomenon of light is called the deviation of light. ![]()
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