Question

A. Explain two features to distinguish between the interference pattern in young’s double slit experiment with the diffraction pattern obtained due to a single slit.

B. A monochromatic light of wavelength 500 mm is incident normally on a single slit of width 0.2 mm to produce a diffraction pattern. Find the angular width of the central maximum obtained on the screen.

Estimate the number of fringes obtained in Young’s double slit experiment with fringe width 0.5 mm, which can be accommodated within the region of total angular spread of the central maximum due to single slit. (the wavelength of the light is given in mm but all the calculations are done using it as nm)

Answer 1

1.Interference pattern in Young's double slit experiment :

(i) All the fringes are of same width.

(ii) Intensity of fringes is same.

Diffraction pattern obtained using single slit :

(i) Central bright fringe is of double the thickness than other fringes.

(ii) Intensity of fringes keep on decreasing as we go away from central bright fringe.

2. A monochromatic light of wavelength 500 nm is incident normally on a single slit of width 0.2 mm to produce a diffraction pattern.

Find the angular width of the central maximum obtained on the screen.

Estimate the number of fringes obtained in Young's double slit experiment with angular fringe width 0.5, which can be accommodated within the region of total angular spread of the central maximum due to single slit.

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