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Hi, I'm not 100% sure but, photons do not have mass per se. De Broglie's is not the appropriate equation to used for photons at rest, however if they have a "non zero" momentum, then I think we do use his equation. Again, don't quote me. I tried :)
This equation applies to the DeBroglie wavelength which applies to calculating the wavelength of a particle as a means to look at its wave-like properties. It mainly applies to subatomic particles because those particles are the only ones that yield a measurable value for the wavelength.
Just to clarify the De Broglie equation does not work for objects without a rest mass (such as light). If you think about how light always has a constant speed it will never stop and thus never have a resting mass.
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