A parallel beam of plane-polarized monochromatic light traverses a length ? mm o

Question

A parallel beam of plane-polarized monochromatic light traverses a length ? mm of an

optically active medium which also scatters the light; the beam travels along the optic axis.

The scattered light is observed in a direction which is perpendicular to both the direction of

propagation of the incident light and to its plane of polarization. The intensity of the

scattered light so observed exhibits equidistant maxima and minima along the length of the

transmitted beam.

a. Explain the origin of these.

b. If ? in degrees/mm is the optical rotatory power of the medium, determine the

number of minima which occur within the length L .

Explanation / Answer

a)the origin of these parallel beam is from a single source having parallel slits.

b)let P be the power

we know that

P = n x sin(theta)/L

or n = (P x L/sin(theta))

where L is wavelength of light and theta is the angle

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