The distance between the second and third dark lines of the interference pattern is 1mm.
Interference in physics is a phenomena when two waves merge by combining their displacements at each and every point in space and time to produce a new wave that has a higher, lower, or same amplitude.
The required distance= one fringe width
= ω = λ D/ d
= ( 600 × 10⁻⁹ ) ( 0.75 ) /0.45 × ( 10⁻³)
=(600×10⁻⁹)(0.75)/0.45×(10⁻³)
= 10 × 10⁻⁴
= 1mm.
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