Question

A pair of narrow slits that are 1.8 mm apart is illuminated by a monochromatic coherent light source. A fringe pattern is observed on a screen 4.8 m from the slits. If the wavelength of the monochromatic light is 450 nm, what is the angular separation between adjacent dark fringes on the screen, measured in milliradians?

Answer 1

Angular separation will be 0.250 miliradian

Step-by-step explanation:

We have given distance between the screen and slits d = 1.8 mm

Wavelength of monochromatic light
`\lambda =450nm=450* 10^(-9)m`

We have to find the angular separation

We know that angular separation is given by
`\Theta =(\lambda )/(d)`

So angular separation will be

`\Theta =(450* 10^(-9))/(1.8* 10^(-3))=250* 10^(-6)radian=0.250miliradian`

So angular separation will be 0.250 miliradian