Question

A laser emits a beam of light with a wavelength of 650nm which is incident upon a double slit and produces an interference pattern 10 m away. The width of each slit is 0.1 mm and the separation of the slits is 0.5 mm. Draw in detail (i.e. to scale with a ruler) the resulting pattern you expect from -13cm to +13cm around the central maxima. Show the interference bright and dark fringes/bands that you would see, and their positions, as well as where the diffraction minima would occur, and how they would effect the interference fringes/bands.find the deltay double slit interference and deltay double slit defraction

Answer 1

Fringe width i.e. distance between center of bright fringe to that of dark fringe will be [(1 * 650 * 10^-9)/(0.5 * 10^-3)] i.e. 1.3 mm.

The transition line between the bright and dark fringes lies just between their centers. However, there is no sudden decreament of intensity but continuous decrease from maximum (at the center of bright fringe) to minimum (at the center of dark fringe.

At 0 cm, there will be center of a bright fringe and a bright fringe will be always followed by dark fringe and vice versa.

I hope now you will be able to draw the required diagram.