Parallel light rays with a wavelength of 610nm fall on a single slit. On a screen 3.10m away, the distance between the first dark fringes on either side of the central maximum is 4.00mm. What is the width of the slit?

The width of the slit will be ".946 mm".

Explanation:

The given values are:

Wavelength = 610 × 10⁻⁹

Length, L = 3 m

As we know,

⇒  

On putting the estimated values, we get

⇒  

On applying cross-multiplication, we get

⇒  

⇒  

the answer is b

explanation: