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The speed of light in plastic is measured at 2.5 x 108m/s. Calculate: a- the index...

The speed of light in plastic is measured at 2.5 x 108m/s. Calculate:

a- the index of refraction,

b- the frequency of the light if the wavelength of this light in a vacuum is 635 nm

c- The energy of a photon of this light

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