Primary School Preservice Teachers’ Alternative Conceptions about Light Interaction with Matter (Reflection, Refraction, and Absorption) and Shadow Size Changes on Earth and Sun

Abstract

The present qualitative study investigates the conceptual representations of 132 preservice Quebec elementary teachers regarding matter–light interaction (reflection, refraction, and absorption) and the size of the shadow of an object on the Earth’s surface illuminated by sunlight. A paper-and-pencil questionnaire composed of six questions was constructed and managed. The data analyses demonstrate that most encounter several conceptual difficulties in explaining phenomena related to light, which are omnipresent in their immediate environment and with which they interact daily. The conceptual difficulties identified in analyzing the students’ explanations were as follows: (1) a black-colored body absorbs all light rays; (2) light travels rectilinearly and stops when it hits a white paper; (3) a mirror reflects light; it does not absorb it; (4) the glass surface of a mirror reflects light; (5) specular reflection and diffuse reflection are confused; and (6) the shadow varies during the day because the Sun moves around the Earth. These findings have implications for creating teaching strategies that confront preservice elementary teachers’ alternative conceptions and their corresponding scientifically accepted counterparts.

Keywords

• prospective teachers
• misunderstanding
• matter–light interaction
• absorption
• diffusion