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Which law of refraction states that light bends due to a change in speed when passing from one medium to another?
Huygens' principle
Law of reflection
FermatтАЩs principle
Snell's law
Snell's law
Snell's law describes the relationship between the angles of incidence and refraction when light passes between two different isotropic media. It states that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is equal to the ratio of the refractive indices of the two media.
Snell's law describes the relationship between the angles of incidence and refraction when light passes between two different isotropic media. It states that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is equal to the ratio of the refractive indices of the two media.
Imagine a car moving from a smooth road onto soft sand at an angle; the wheels hitting the sand first slow down, causing the car to pull or turn toward the sand. Light behaves similarly as it transitions between media of different optical densities.
n1тАЛsin(i)=n2тАЛsin(r) тАФ Snell's Law where n is refractive index and ╬╕ is the angle with the normal.
n=vcтАЛ тАФ Definition of refractive index where c is speed in vacuum and v is speed in medium.
Light travels at different speeds in different materials; when it crosses a boundary at an angle, the side of the wavefront hitting the new medium first slows down (or speeds up) relative to the other side. This difference in velocity causes the path of the light ray to bend. The law is mathematically expressed using the refractive index, which represents the optical density of the material.
Light bends towards the normal when moving from a rarer medium to a denser medium.
Light bends away from the normal when moving from a denser medium to a rarer medium.
The incident ray, the refracted ray, and the normal at the point of incidence all lie in the same plane.
Allows determination of refractive indices of unknown materials.
Essential for designing optical instruments like lenses, prisms, and fiber optics.
Assumes the media are linear and isotropic.
Does not account for diffraction or non-linear optical effects at extremely high intensities.
Corrective spectacles and contact lenses.
Fiber optic communication systems.
Microscopy and telescope designs.
Huygens' principle relates to wave propagation, not refraction specifically.
Law of reflection applies to surfaces where light bounces back, not passes through.
Fermat's principle states light follows the path of least time, which is the underlying derivation for Snell's law.
D is correct тАФ Snell's law defines the quantitative relationship between the angle of incidence and the angle of refraction when light changes media.
Remember that refractive index is inversely proportional to speed (nтИЭv1тАЛ); the denser the medium, the slower the light, and the more it bends toward the normal.
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