At the first minimum next two of the central bright spot in a double slit experi

Question

At the first minimum next two of the central bright spot in a double slit experiment, the phase difference between the two waves arriving from the slits is: 0 rad pi/2 rad it rad none of the other answers tire correct pi/4 rad Reflection from a soap bubble film (n = 1.42) of thickness 106 nm results in a constructive interference in the reflected light if this film is illuminated by a beam of light with a wavelength of 001 nm. What are the next three thicknesses of this film that will also result in a constructive interference? 318 nm, 530 nm, 742 11111 212 nm, 424 nm, 636 11111 53.0 nm, 35.3 nm, 26.5 11111 212 nm, 318 11111, 424 11111 67.0 nm, 42.4 nm, 22.3 11111

Explanation / Answer

7] option c,

Dark fringes area at pi, 3pi, 5pi...whereas brriht fringes are at 2pi, 4pi etc

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