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Sagot :
The substance is zircon, of which interference analysis is done.
Wavelength of light in solid = λ = 329 nm
Wavelength of light from he-ne laser = λ' = 633 nm
Interference effect = n =
= n =  λ' / λ
= n = 633 / 329
= n = 1.92
The interference, in physics, is the net effect of the combination of two or more wave trains moving on intersecting or coincident paths. The effect is that of the addition of the amplitudes of the individual waves at each point affected by more than one wave.
Thus the substance is zircon.
To know more about Interference Effect:
https://brainly.com/question/10599901
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