When electron returns from fourth to second energy level of H atom colour of emitted light is

According to Balmer series.

$\frac{1}{\lambda }=R\left[\frac{1}{n_1^2}-\frac{1}{n_2^2}\right]$

n=3,4,5,6,......

Spectra basically is belonging the location of visible zone. When wavelength is in between 4000A^o to 5000A^o then, green color of light would the atom emit. When it changes from the n=5 level to n=2 level.