Question

Define red shift and blue shift in light?

Answer 1

red shift definition. In physics, the reddening of light sent out by an object that is moving away from an observer. (See Doppler effect.) Note: The red shift that can be observed in light from distant galaxies suggests that the universe is expanding, and thus supports the Big Bang theory.


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