Heat rays

Description: Instructional film analysing the relationship between heat and light radiation; the sun as a source of light and heat, making a photograph with light and heat rays; applications and uses of heat rays; reflection, refraction and movement of heat rays; applications of these properties of heat rays to everyday life; relationships between heat and light as a form of vibration of electro-magnetic waves of different frequencies; the role of heat rays in maintaining life on this planet.