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Which phenomenon causes bending of the ray of light when it moves in the earth's atmosphere?
Atmospheric refraction
Atmospheric scattering
Atmospheric reflection
Atmospheric dispersion
Atmospheric refraction
Atmospheric refraction is the phenomenon responsible for the bending of light rays as they travel through the earth's atmosphere. This occurs because the upper layers of the atmosphere are rarer (lower optical density and refractive index) while the lower layers near the earth's surface are denser (higher optical density and refractive index).
Atmospheric refraction is the phenomenon responsible for the bending of light rays as they travel through the earth's atmosphere. This occurs because the upper layers of the atmosphere are rarer (lower optical density and refractive index) while the lower layers near the earth's surface are denser (higher optical density and refractive index).
Imagine rolling a toy car from a smooth wooden floor onto a thick carpet at an angle; the wheels hitting the carpet first slow down and cause the car to swerve or bend its path. Similarly, light passing through layers of air of varying density bends due to changing speeds.
AR = Atmospheric Refraction causes Bending and Twinkling.
╬╝=vcтАЛ тАФ Refractive index as a ratio of speed of light in vacuum to medium
n1тАЛsin(╬╕1тАЛ)=n2тАЛsin(╬╕2тАЛ) тАФ Snell's Law of Refraction
As light from celestial bodies (like stars and the sun) or terrestrial sources passes through layers of air with continuously varying temperature, pressure, and optical density, its speed changes gradually. According to Snell's law, this continuous variation in refractive index (╬╝) forces the light ray to bend towards the normal as it enters denser layers, causing apparent shifts in position, twinkling of stars, and advanced sunrise/delayed sunset.
Refractive index of the atmosphere increases progressively from top to bottom as air density increases.
Light bends continuously towards the normal as it travels from rarer to denser layers.
Accounts for phenomena such as twinkling of stars and oval shape of the sun at horizon.
Different wavelengths (colors) bend slightly differently, but overall bulk bending is dominated by refraction.
Helps scientists study celestial refraction corrections in astronomy.
Causes distortion and blurring in astronomical telescope images.
Advanced sunrise and delayed sunset
Twinkling of stars (Scintillation)
Apparent displacement of stellar positions
Option B (Atmospheric scattering) is responsible for the blue color of the sky and reddish appearance of the sun at sunset, not bending of rays.
Option C (Atmospheric reflection) is minor compared to refraction in regular sky observation.
Option D (Atmospheric dispersion) splits white light into component colors (e.g., rainbow), but the general bending trajectory is refraction.
A is correct тАФ Atmospheric refraction is the phenomenon causing the bending of light rays as they pass through layers of air with varying optical densities in the earth's atmosphere.
In competitive exams like RRB ALP and SSC, always distinguish between refraction (bending due to density gradient), scattering (bouncing in all directions by particles like Rayleigh scattering), and dispersion (splitting of white light into spectrum).
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