A variation in the frequency of waves as the source and the observer move towards or away from each other is called as Doppler Effect. When visible light is shifted towards the blue end of the spectrum is called as the blue shift of Doppler effect. Here is the Doppler effect blue shift wavelength formula which will guide you to calculate the blue shift wavelength by dividing the (e x c) with ( c + v), where e is the emitted wavelength, c is the speed and v is the velocity.