Experimental instrument for measuring glass refractive index

Abstract

The invention provides an experimental instrument for measuring glass refractive index. The experimental instrument is mainly composed of a silver needle, a fixing nut, a needle arm, an iron clampingpiece, a glass brick, a base, a fixing shaft, a pointer disk, a pointer, a needle sleeve, fixing screws, a dial and the like, wherein the needle sleeve can be independently taken down; the glass brickis fixed by the iron clamping piece; the limiting hole of the dial sleeves a limiting column of the pointer disk; the iron clamping piece and the dial are fixed on the pointer disk through the fixingscrews; the pointer of the pointer disk and a first fixing nut on a first needle arm are exposed out of the dial, the fixing rotating shaft below the pointer disk is inserted into the base, the dialcan rotate by 360 degrees, the glass brick does not need to be moved, the incident angle and the refraction angle can be directly read on the dial only through movement of the needle arm, the structure is simple, and operation is convenient.

Description

technical field [0001] The invention relates to a teaching instrument, in particular to an experimental instrument for measuring the refractive index of glass. Background technique [0002] Determining the refractive index of glass is an important experiment in high school physical optics. It mainly calculates the refractive index of glass by measuring the incident angle of a light beam and the refraction angle of the light beam after it passes through the glass. At present, the common method for measuring the refractive index of glass used in high school teaching is the needle insertion method to measure the refractive index of glass. In the needle insertion method, the thin needle can only be inserted into the wooden board by hand, and it is likely that the needle cannot stand vertically. Inserting straight into the board will cause a certain experimental error, and the angle cannot be read at the same time, which will cause a certain error in the process of drawing the li...

AI Technical Summary

Problems solved by technology

At present, the common method for measuring the refractive index of glass used in high school teaching is the needle insertion method to measure the refractive index of glass. In the needle insertion method, the thin needle can only be inserted into the wooden board by hand, and it is likely that the needle cannot stand vertically. Inserting straight into the board will cause a certain experimental error, and the angle cannot be read at the same time, which will cause a certain error in the process of drawing the line later. Some students even think that the angle between the two needles and the normal line is the angle of refraction, which is directly used for calculation. , I also asked the teacher why the refractive index of the glass I measured is always equal to 1, which is not conducive to intuitive experimental teaching and is prone to mistakes

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