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. 2012 Dec 11;4(1):38–50. doi: 10.1364/BOE.4.000038

Fig. 3.

Fig. 3

The multilayer refraction of laser beam in sample arm. t and n are the physical thickness and RI of the sample. no is the RI of the immersion medium (water), n1 is the RI of the glass plate, θ1 is the incident angle, θ2 and θ3 are the refractive angles. Lo is the distance of the objective lens moved during imaging.