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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.

Frequency is prperty of source not prperty of medium thats why frequency doesn't change form medium to medium

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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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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.

Because velocity and wavelength changes so frequency remains constant

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