Respuesta :
Answer:
Because the speed and the wavelenth of the light changes
Explanation:
When light moves from a medium to a different medium, its speed changes. In particular, the speed of light in a certain medium is defined by the refractive index of the medium:
[tex]n=\frac{c}{v}[/tex]
where
c is the speed of light in vacuum
v is the speed of light in the medium
So, the higher the refractive index, the slower the light into that medium.
Moreover, the wavelength of light is related to its speed, according to
[tex]\lambda=\frac{v}{f}[/tex]
where f is the frequency. The frequency of the light does not change when it passes from one medium to another, so the wavelength [tex]\lambda[/tex] must change as well.
In this situation, we have light passing from air to water. Air has a refractive index of approximately 1.00, while water has a refractive index of approximately 1.33. From the definitions above, we can conclude that light slows down when passing from air to water, and so its wavelength decreases as well.
Moreover, the change in speed of the wave also causes the change in its direcion, according to Snell's law:
[tex]n_1 sin \theta_1 = n_2 sin \theta_2[/tex]
where n1 and n2 are the refractive index of the first and second medium, while [tex]\theta_1, \theta_2[/tex] are the angle between the direction of the light and the normal to the interface in the first and second medium respectively. This phenomenon is called refraction, and it tells us that when light moves between two mediums with different refractive index, it changes direction.
The refraction of light occurs due to change in speed of light as it passes from one medium to another.
Explanation:
The refraction of the light is defined as the bending of the ray of light as it enters from one medium to another. The speed of light in a particular medium depends on the refractive index of the medium.
The mathematical expression for the speed of light in a medium is given as:
[tex]\boxed{v=\dfrac{c}{\mu}}[/tex]
Here, [tex]v[/tex] is the speed of light in the medium, [tex]c[/tex] is the speed of light in vaccum and [tex]\mu[/tex] is the refractive index of medium.
As the refractive index of the medium changes, the speed of light also changes. The refractive index of water is higher than the refractive index of air so the speed of light in water will be less than the speed of light in air.
Due to the change in speed, the path and the wavelength of the light will also be affected. In case of air and water, the light will travel less distance in water as compared to air in the same time.
Due to change in path of the light, the ray of light appears to be bending from its original path as it moves through water.
Thus, the refraction of light occurs due to change in speed of light as it passes from one medium to another.
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Answer Details:
Grade: High School
Subject: Physics
Chapter: Refraction
Keywords:
light, refraction, air, water, change, refractive index, speed of light, bending of light, original path.
