SU1019481A1 - Training apparatus for light polarization demonstration - Google Patents

Abstract

A TRAINING DEVICE FOR DEMONSTRATION OF POLARIZATION OF LIGHT, containing a source of linearly polarized light placed on a stand, an amplifier, a lens and a screen, so that with the purpose of aiming to determine the phase changes of the reflected beam When it is its Brewster angle, it has a vertical rail mounted on the copting & Ke line, a background sector, a pantograph, one of the shades. whose nets are free, and the opposite is freely installed in the direction & rail, the pantograph shoulders connected to the fixed and free hinges are psychologically equal, and the source of light, phonos 1 sector, analyzer, lens and screen are located on the amp & Chah associated with enshrined in the nap. ravl yushey hinge.

Description

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The invention relates to educational instruments for the OLA demonstration of optical phenomena in the course of physics, it can be used in secondary schools, technical schools, and in universities when reading lecture courses and can be used to determine the refractive index of various dielectrics.

The closest to the invention according to the technical essence is the OLY training device for demonstrating the highlight of light, which contains a source of linearly polarized light placed on the stand, an analyzer, and a lens to the screen 3.

A disadvantage of the known device is the inability to demonstrate phase changes of the reflected beam when it passes through the Brewther angle.

The purpose of the invention is to demonstrate the phase changes of the reflected beam when it passes through the Brewster angle.

This goal is achieved by the fact that the Test Device for demonstrating the light paparization, which contains a source of linearly polarized light placed on a stand, an analyzer, a lens and a screen, has a vertical rail mounted on the stand with a guide, a background sector, a pantograph, one hinge of which is fixed , and the opposite is freely mounted in the guide rail, with the pantograph arms associated with the fixed and free hinges being equal in pairs, and the light source, background sector, analyzer, lens and screen are located shoulders associated with a fixed guide hinge.

FIG. 1 shows the device, the appearance; in fig. 2 - the same, top view; in fig. 3 - pantograph, with guide rail.

The device consists of a stand 1, on which a vertical rail 2 is fastened. Along the rail, by means of the handle 3 the hinge 4 of the pantograph 5 is moved. Opposite hinge | The 6 pantograph is fixed without moving in the lower part of the rail 2. The other two hinges of the pantograph 7 and 8 are respectively connected with the bar 9, on which the analyzer 1O and IU & lens 11 are attached to the screen. 12, angled to the bar 9, and with a moving sector 13, for which there is a source 14 of linearly polarized radiation 1 and a demonstrating imbal 15, which allows to judge the magnitude of the deflection of the beam from the vertical. In this case, the hinge 7 moves along the groove 16 in the fixed sector 17. The radiation source is ukregshen in the holder and has the ability to rotate around the longitudinal axis. The analyzer is equipped with an arrow 19 to judge its position. The dielectric plate 2 is located on the stand 1 perpendicular to the rail 2.

The device works as follows

The light, propagating along the shoulders of the pantograph and reflected from the dielectric plate 20, passes through the analyzer 9, the lens 11 and hits the screen 12. The light source is rotated in the holder 18 so that the plane of polarization of the bend does not coincide with the plane of its fall on the dielectric plate 2D, by turning the analyzer, 1O, we darken the field on the screen. When the handle 3 is moved upwards along the rail 2, the angle of incidence of the radiation on the plate 2O decreases, approaching the angle of Brewster. In this case, the field on screen 12 is illuminated. To darken it, the analyzer 10 must be rotated through a certain angle. When the Brewster angle is reached, the transmission plane of the analyzer will be perpendicular to the plane of incidence of the radiation on the plate 2O. With a further change in the angle of incidence, it will appear that in order to darken the field on the screen, the analyzer must be turned in the same direction as before. This indicates that when the light is incident on the dielectric plate at the Brewster angle, there is no component in the reflected beam in the plane of incidence, and when the Brewster angle passes, the radiation component in the plane of incidence undergoes a phase jump of 180

about

The device allows us to demonstrate the Brewster angle in a different way. For this, the light source is oriented so that the polarization plane coincides with the angle of incidence of radiation on the 2Q plate. The analyzer 10 is removed. Then when the Brewster angle is reached, the light field is on. the screen disappears. The Brewster angle for a selected dielectric is measured by limb 15 located on the moving background sector. Thus, the device is pre-swappable: the device allows for a blatant demonstration of a phase jump of 180 ° when passing through the Bryusuger angle. The device can be used to determine the Brewster angle (which is equivalent to the definition of the refractive index) of different numbers.

3 2 15 20 8 f8 / 4g 1

/ U / 814 electricians “At the same time, the reflected beam always falls into the same place on the analyzer and lens, which eliminates the need for additional alignment. During the test, experience. The latter fact has a positive effect on the measurement accuracy.

Claims (1)

A TRAINING INSTRUMENT FOR DEMONSTRATING LIGHT POLARIZATION, containing a linearly polarized light source, an analyzer, a lens, and a screen located on a stand, characterized in that, in order to demonstrate phase changes in the reflected beam when it passes through the Brewster angle, it has a vertical rail mounted on the stand with a guide, a background sector, a pantograph, one of which uij> nirov is fixed, and the opposite one is freely installed in the guide rail, and the pantograph's shoulders are connected with a fixed and free hinges pairwise equal, and the light source, background sector, analyzer, lens and screen are located on the lamentations associated with fixed in cash. equalizing the hinge. - SU ,,, 1019481 Fig! £ 019,481