Projection spectrograph as a tool for light polarization classrooms demonstrations

Química Nova

Faria, Gregório Couto¹  Universidade de São Paulo, São Carlos, Brasil¹  Azevedo, Eduardo Ribeiro de¹  Castro Filho, Jae Antonio de¹  Batalhão, Tiago Barbin¹  Sartori, Josimar Luiz¹  Nunes, Luiz Antônio de Oliveira¹  Santoni, Ercio¹ 

关键词: projection spectrograph;    optical activity;    birefringence.;   

DOI  :  10.1590/S0100-40422010000500036

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

This article describes the use of a projection spectrograph based on an overhead projector for use in classroom demonstrations on light polarization and optical activity. A simple adaptation on a previously developed apparatus allows illustrating several aspects of optical activity, such as circular and linear birefringence, including their wavelength dependence. Specifically, we use the projection spectrograph to demonstrate the optical activity of an aqueous solution of sugar (circular birefringence), of a quartz plate and of an overhead projector transparence film (linear birefringence). A historical survey about the optical activity discovery and the main principles involved is also presented.

【 授权许可】

Unknown