\(m=\frac {m_{0}}{\sqrt {1-\frac {v^{2}}{c^{2}}}}\)

As speed of light changes in a medium, should we change the denominator also?

If we dont change the denominator, then for a photon travelling with a high fraction of speed of light in a medium (less than c), mass should be defined, but it is not.

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## Comments

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TopNewestThe speed of the photon is same regardless of the medium.

It is it's apparent speed that we observe (which is lower due to collisions with the particles of the medium).

Note:This argument holds for any mass less particle as well.Log in to reply

The 2nd is not. Obvio the first is

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I'm sorry, I don't understand what you're saying.

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As I am saying mass should be defined, which is not only in photon's case

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