Answer:
The distance on the screen from the central maxima to the second order bright line is 6.33 mm
Step-by-step explanation:
It is given that,
Wavelength of lase light,

Separation between slits, d = 0.4 mm = 0.0004 m
Distance between screen and slits, D = 2 m
We need to find the distance on the screen from the central maxima to the 2nd Order bright line. It can be calculated using :

n = 2
Y = 0.00633 m
or
Y = 6.33 mm
So, the distance on the screen from the central maxima to the second order bright line is 6.33 mm. Hence, this is the required solution.