Question

Can you explain blue shift and red shift

Answer 1

 A blue shift is any decrease in wavelength, with a corresponding increase in frequency, of an electromagnetic wave, the opposite effect is referred to as red shift. In visible light, this shifts the color from the red end of the spectrum to the blue end.

Answer 2

A blueshift is any decrease in wavelength, with a corresponding increase in frequency, of an electromagnetic wave; the opposite effect is referred to as redshift. In visible light, this shifts the color from the red end of the spectrum to the blue end