What is the distance, in meters, between adjacent fringes produced by a diffraction grating having 125 lines per centimeter

The correct answer will be "9×10⁻³ m".

Explanation:

The given values are:

Number of lines

N = 125

As we know

The distance between the adjacent fringes is:

⇒

Where, λx = Screen distance

              d = slit width

and,

⇒

Where,

Hence,

⇒

On substituting the values, we get

⇒

⇒

it about 600 mph from what i calculated