Interference and defraction, conceptual question. Laser light splits into two be

Question

Interference and defraction, conceptual question.

Laser light splits into two beams, one of wich is sent on a path tat takes it through a slab of glass, where light's speed is about two-thirds of what it is in air. The other beamt travels an identical length path, entirely in air. Wich interference occures when the two lights are recombined?

a) constructive

b) destructive

c) could be one of both or in between, depending on the glass slab thickness

d) ther is no interference

Answer = a) constructive. Why is that?

Explanation / Answer

Solution) As it is said when two lights are recombine it leads to constructive interference. This interference occurs when two waves meet in such a way that their crests line up and resulting wave has higher amplitude . So this leads to constructive interference .

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