What is Doppler effect in light? Write the expression for Doppler shift.

Explanation

Doppler effect: The apparent change in frequency of waves from a source due to the relative motion between an observer and the source is called Doppler effect. Expression for Doppler shift is given by
`(Delta v)/(v) = - (v_("radial"))/(e )`
Where, e = Speed of light
`v_("radial") ` = Radial component of the source velocity