Given:
The distance between the two narrow slits is

The distance between the slit and the screen is

The wavelength of the light is

Required: Distance of the third bright fringe from the central maximum.
Step-by-step explanation:
The third bright fringe will have m = 3.
The distance of the third bright fringe from the central maximum can be calculated by the formula

On substituting the values, the distance can be calculated as

Final Answer: The distance of the third bright fringe from the central maximum is 0.0179 m.