N. K. Sethi. 



Phil. Mag. Ser. 6, Vol. 42, PL XX 



Fig. 1. 



Befractive Index of Cylinder less than that of the Liquid. 



Fig. 2. 



ill 



Refractive Index of Cylinder greater than that of the Liquid. 



Diffraction Fringes due to a Cylinder immersed 

 in a Liquid Medium. 



