Projection spectrograph as a tool for light polarization classrooms demonstrations

Quimica nova

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

[1] Universidade de São Paulo, São Carlos, Brasil

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 describesthe use of a projection spectrograph based on an overhead projector for usein classroom demonstrations on light polarization and optical activity. A simpleadaptation on a previously developed apparatus allows illustrating several aspectsof optical activity, such as circular and linear birefringence, including theirwavelength dependence. Specifically, we use the projection spectrograph to demonstratethe 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 principlesinvolved is also presented.

【 授权许可】

CC BY