JSC Science Note2 11th Chapter Light. The branch of physics dealing with the properties and behavior of light is called optics. Light is a form of energy which helps us to see the objects. Have you ever wondered why we are able to see the different objects around us, their images in a mirror or in a pond? This is simply due to the reflection of light. It is the phenomenon of bouncing back of light after striking a smooth polished surface. Why is the word “ambulance” written backward in ambulance car? This is due to lateral inversion -The phenomenon due to which the left side of an object appears to be the right side of the object in its image in a reflecting medium (mirror ) and vice-versa is called the lateral inversion. Enjoy interesting trivia related to spherical mirrors(concave and convex) and the plane mirror, optics, sunlight. Understand the differences between mirrors and lenses. Learn about the formation of rainbow. Did you know that you can see a rainbow only when your back is toward the sun?
JSC Science Note2 11th Chapter Light
Light travels in a straight line as long as it is traveling in the same medium. This is referred to as the rectilinear propagation of light. An object that emits light on its own is called luminous, object. The sun and the stars are natural luminous sources of light. If an object does not emit light of its own, it is said to be a non-luminous object. The moon is a non-luminous body as it shines due to reflected sunlight. Non-luminous objects can be classified into opaque, translucent and transparent objects.
Reflection of light refers to the phenomenon in which a beam of light, when incident on a surface, returns into the same medium. There are two types of reflection – regular reflection and irregular or diffused reflection. When light is reflected, it follows two laws called laws of reflection.
A spherical mirror is obtained by taking a part of a thin hollow sphere of glass or metal. Its reflecting surface is the curved part of a hollow sphere. It can either be concave or convex. The terms that are often used in the study of spherical mirrors are the center of curvature, the radius of curvature, pole, principal axis, focus and, focal length.
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