Hey,

We know that,

the distance between the first 2 minimum of either side of the central maximum is equal to 2 lambda D/ d

where,

it is given that,

d=0.2mm

D= 2 m

lambda=5000A

is,

= (2*5*10^3*10^-10*2)/(2*10^-1*10^-3)

=10*(10^-7/10^-4)

=10^-2 m

which is the required answer.

I hope this helps.

All the best!