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If light travels from a rarer medium to a denser medium, then which of the following is correct?
- a)Speed of light remains same
- b)Speed of light increases
- c)Speed of light decreases
- d)cannot be determined
Correct answer is option 'C'. Can you explain this answer?
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If light travels from a rarer medium to a denser medium, then which of...
- The mechanism by which a light wave is transported through a medium occurs in a manner that is similar to the way that any other wave is transported - by particle-to-particle interaction. Like any wave, the speed of a light wave is dependent upon the properties of the medium. In the case of an electromagnetic wave, the speed of the wave depends upon the optical density of that material.
- The optical density of a material relates to the sluggish tendency of the atoms of a material to maintain the absorbed energy of an electromagnetic wave in the form of vibrating electrons before reemitting it as a new electromagnetic disturbance. The more optically dense that material is, the slower that a wave will move through the material. Hence, option (c) is correct. One indicator of the optical density of a material is the refractive index. The refractive index of medium 2 with respect to medium 1 is given by the ratio of the speed of light in medium 1 and the speed of light in medium 2.
- For example, the refractive index of water, nw = 1.33. This means that the ratio of the speed of light in air and the speed of light in water is equal to 1.33.
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If light travels from a rarer medium to a denser medium, then which of the following is correct?a)Speed of light remains sameb)Speed of light increasesc)Speed of light decreasesd)cannot be determinedCorrect answer is option 'C'. Can you explain this answer?
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