Q5 of 79 Page 380

Two narrow slits emitting light in phase are separated by a distance of 1.0 cm. The wavelength of the light is 5.O × 10-7 m. The interference pattern is observed on a screen placed at u distance of 1.0 m. (a) Find the separation between the consecutive maxima. Can you expect to distinguish between these maxima? (b) Find the separation between the sources which will give a separation of 1.0 mm between the consecutive maxima.

Given, distance between the slits,

distance between the slits,


distance between the slits and the screen,


wavelength of the light,


(a)The separation between two consecutive minima or maxima is the fringe width(w) of the pattern given by



(b) Here we are given


Therefore,


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