Answer:
"6.67 mm" is the right solution.
Step-by-step explanation:
The given values are:
- L = 2.5 m
- y = .0125
- λ = 600 nm
As we know, the equation
⇒

On substituting the values, we get
⇒

On applying cross multiplication, we get
⇒

⇒

⇒

For new distance, we have to put this value of "a" in the above equation,
⇒

⇒

⇒

⇒

The total distance will be twice the value of "y", we get
=

or,
=
