64 



E. I. Gal'perin et at. 



This projection is found as the geometric locus of the projected traces of 

 the interface with rays with azimuths 10° apart from one another and with 

 projections shown by the radial hnes. 



The projection of the traces of intersection of the rays with the interface are 

 found as projections of points on the rays and on the interface, then points 

 having the same depth. A ray with its azimuth in the first medium at 300°, 

 intersects the inclined refracting interface at a depth of 356 m. The projection 



290 



280 



,2 70 



260 



250 



190 igo 170 



Fig. il. Example of determination of direction of refracted and reflected rays and 

 of a ray refracted on transition from second medium to first. 1 — plane of rays; the points 

 correspond to directions: A — of a ray incident on a refracting boundary (120 and 30°); 

 Ni 2 — of the normal to the refracting boundary ; B — of a refracted ray (125° and 39°) ; 

 Bi — of a ray striking the reflecting boundary after refraction (125° and 39°); N2 — of 

 the normal to the reflecting boundary (318° and 10°) ; D — of a reflected ray (309° and 

 59°); E — of a ray striking the refracting boundary after reflection (129° and 59°); 

 A'2 I — of the normal to the refracting boundary (180° and 10°) after reflection; F — of 

 the emergent ray (132° and 50°). 



