Reflection and the Ray Model of Light - Image Formation in Plane Mirrors Image Characteristics Why is an Image Formed? Image Characteristics of Plane Mirrors Ray Diagrams for Plane Mirrors What Portion of a Mirror is Required? Right Angle Mirrors Image An image location is the location in space where all the reflected light appears to diverge from. Since light from the object appears to diverge from this location, a person who sights along a line at this location will perceive a replica or likeness of the actual object. Virtual vs. Real Images In the case of plane mirrors, the image is said to be a virtual image. Virtual images are images that are formed in locations where light does not actually reach. Light does not actually pass through the location on the other side of the mirror; it only appears to an observer as though the light is coming from this location. Whenever a mirror (whether a plane mirror or otherwise) creates an image that is virtual, it will ...
• CLASS 9 Landforms of the Earth • GEOMORPHOLOGY • Geo – earth, morph – form, ology – science • Systematic study of the earth’s relief feature • Orogeny – mountain building movements (9) • Orogeny – extends in time for some tens of millions of years • Oro – mountain , geny – formation MOUNTAINS • Mountain building period – between 600 and 3500 million years ago • Three recent orogenics are: • Caledonian – 350 million years old (examples: Mountains of Scotland and Scandinavia) • Hercynian – 250 million years ago (examples: Urals , Appalachians) • Alpine – 30 million years ago (examples: Himalayas, Andes, Rockies) DEFINITION OF MOUNTAINS • Landform that rise above the surrounding land above 600 metres • Landform below 600m – hill. • Peak- highest part of the mountain. • Ranges- long chains of group of mountains. • Mountain System- a group of ranges, displaying similar alignment, form, s...
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