When the ray of light travels from air to glass prism, â€˜iâ€™ represents the angle of incidence whereas the angle of refraction is represented by â€˜r1â€™.
Â· â€˜D1â€™ represents the angle of deviation between the direction of the incident ray and the refracted ray.
Â· When the ray of light passes from glass prism to air, â€˜r2â€™ represents the angle of incidence and â€˜eâ€™ represents the angle of emergence or the angle of refraction.
Â· â€˜D2â€™ represents the angle of deviation between the direction of the incident ray and the refracted ray.
Â· D represents the angle of deviation between the direction of the incident ray and the ray of light emerging from the prism.
Â· The angle of deviation depends on the material of the prism and the angle of incidence.
The phenomenon of splitting of light occurs when a narrow beam of white light is incident on a glass prism. The refracted ray of light emerging from the prism consists of mainly seven colors. The seven colors emerge in a sequence i.e. violet, indigo, blue, green, yellow, orange, and red called VIBGYOR.
Phenomena Observed Due to Refraction
Â· The bottom of a swimming pool filled with water appears to be raised due to the phenomenon of refraction of light. This is because the rays of light from the bottom of the pool while traveling from water to air, get refracted away from the normal.
Â· An object, for example a pen in a glass of water, appears to be bent at the boundary of the two media due to the phenomenon of refraction of light. This is because the rays of light from the end of the pen while traveling from water to air, get refracted away from the normal.
Â· The phenomenon of the twinkling of stars is due to the refraction of light through the atmosphere. The rays of light from the stars get refracted from the various layers of the earthâ€™s atmosphere before reaching the earth. This causes the perception of the twinkling of stars.
The phenomena of advanced sunrise and delayed sunset are due to the refraction of light through the atmosphere. The rays of light from the sun get refracted from the atmosphere of the earth. This causes the sun to appear a little before the actual sunrise and a little late after the actual sunset. This atmospheric refraction is the reason for the appearance of the oval shape of the sun at sunset and sunrise.
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