It deals with the Magneto Rotatory Behaviour of some Optically Active Substances in Solution@IAC

Bhatnagar, SS

Jain, BD

Mathur, KN

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The Magneto Rotatory Behaviour of some Opti- cally Active Substances in Solution (Received for publication, 30t h July, 1929.) Optical *rotation haa been ascribed to the '' strncture " "of the substance or in Lord Keloin'e phrase to the chirality " of the medium. Following Larmor'~ treatment, let us consider the propagation of right handed circularly polarieed light in, say, sugar solution, in which it8 velocity differa slightly from that of n left-handed circularly polarieed beam. This gives rise to the phenomenon of rotation of tho plane of polarisation. If reflected back it becomes a left-handed train of waves travel- ling backwards and goes with a different speed, flu& appropriate to left-handed waves. The medium thus ~pos~eagaa chird p m  pertieq and change of sign of the m-ordinate in the dimtion 02 propagation must affect the equationa of propagation. Now consider a wave-train travelling in a medium magnetised along X-the direofion of propagation, the change of ita chirality by reflection no longer produces any change in the velocity. No intrinsic chirality is thus present in the medium and the magnetic rotatory polarisation must be traced fo the i m p r e d  magnetism which ie eb vector agenoy directed along *he X-axis and can tilierefoh be connected with diffewnce 4 valoaitp for diffemnt directions dong that &a. 

The Magneto Rotatory Behaviour of some Optically Active Substances in Solution

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