Tge perfectly flat piece of glass (n=1.50) is placed over a perfectly flat piece of plastic (n=1.20). They touch at A and there is a film (wedge) of air between the glass and plastic. Light of wavelength 600nm in air is incident normally from above. The location of the dark fringes in the reflected light is shown below. Index of refraction of air is 1.    a) how thick is the air film between the glass and plastic at B? Units of nm   b) water (n=1.33) then seeps into the region between the glass and plastic filling the wedge with water. How many dark fringes are seen when all the air is displaced by water?

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Interference of Light

The word "constructive" signifies addition in interference. Constructive interference occurs when the path of the waves that start from the slit differs by 1 entire wavelength or in the intervals of the same. Hence, the waves that are presented on the screen are in phase (crest to crest/trough to trough). The waves interfering constructively forms bright fringes on the screen.