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4. The wavelength of light in air is 5000 A.U. The numberof waves in 50 cm of air is​

Answer»

Answer:

Speed of light in AIR is 3*10^8 m/s

W = WAVELENGTH

N =REFRACTIVE index of the medium =1.5

W in air =5000 A =5*10^-7 Metres

FREQUENCY in air is 5*10^14 hz

So answer is 3000 A



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