The relation between angles of incidence and deflection caused by the refraction and reflection of light beam at the ferroelastic domain walls in Gd 2 (MoO 4 ) 3 , Bi 4 Ti 3 O 12 and Rochelle salt crystals has been treated on the basis of crystal optics. Numerical analysis of the relation has been carried out for incident angles from 0° to 90°. At the incident angle of 0°, the deflection angles obtained by the analysis are 2.25° for the c plate of Gd 2 (MoO 4 ) 3 , 14.6° for the b plate of Bi 4 Ti 3 O 12 and 4.43° for the a plate of Rochelle salt. The experimental results with a He-Ne laser for these crystals are in satisfactory agreement with the calculated ones. The intensity ratio of the deflected beam to the direct beam is in the order of 10 -2 for Gd 2 (MoO 4 ) 3 and 10 -3 for Rochelle salt.
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Tsukamoto et al. (1984) studied this question.
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