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why the frequency of light does not change when it entered into the denser medium ?

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CBSE/Class 12/Science/Physics

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This is because frequency is the inherent property of any matter. It is fixed and specific for a particular substance. It doesn't vary as its the 'identity' of a particle or a wave.
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The energy of light is directly proportional to the frequency. As light enter to denser medium the energy of light does not change. hence, the frequency of light remains constant.
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Frequency is prperty of source not prperty of medium thats why frequency doesn't change form medium to medium
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Physics Guru

When light enters dencer medium its velocity decreases , due to slow velocity it leaves medium slowly, therby its wavelenth increases, as frequency is ratio of velocity and wavelength it remains same.
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Mentor/ Tutor

Properties of wave travel are characterised in two ways- 1- Properties dependent on source 2- Properties dependent over medium and each work indipendently. Since Frequency is a property source so it is not affected by medioum at all.
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Because velocity and wavelength changes so frequency remains constant
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