A ray diagram showing refraction at the boundary between air ... The diagram shows that as wave travels into a denser medium, such as water, it slows down and wavelength decreases.

Refraction is the change in direction of a wave as it travels from one medium to another. For instance, when light travels from air to glass or water waves travel from deep to shallow water.

Children observe how a magnifying glass focuses sunlight to create heat, examine the effects of light on objects like leaves and pencils, and notice reflections in water and mirrors, including ...

Photo album. Bombay. File FL/E/1/44. From India Office Select Materials, The British Library, London. 6. Christos Lynteris, “The Prophetic Faculty of Epidemic Photography: Chinese Wet Markets and the ...