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OCR: n-1 Cp n+ where index of ret ac tion density constant (n-1)(n+1) i.e. very closely -77 d-= )...0 N where: length of light path in heated air wave clengh light in vacuuin numb wave- Jengths u0e in vacvum n. whcre: N andN are numbers wavelengths under experim ental conditions substiturting equation N-N n-1Nl (n-1)( relating temperature to density: V-N N= x-1 solving for temperature: AM n-1 N fringe displacement measured in fringe widths wavelengh vacuum number along substituting equat rehting