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Actually, you can use DeBroglie's equation on photons. Even though photons have no rest mass, they do have a nonzero momentum. Thus, the wavelength relationship still works for photons, you just have to use their momentum and the equation λ=h/p for photons.
Rest mass is the mass of the object when it has no momentum. Since photons are never at 0 momentum, light is something that has no rest mass. De Broglie’s equation can be used to transition between dealing with particle properties and wave properties.
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