Density and Elasticity
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REFRACTION AT PLANE SURFACES Refraction is a phenomenon, due to which a ray of light deviates from its original path, while travelling from one optical medium to another optical medium. The change of direction is caused by a change in speed of light in different medium. For example, when light travels from air into water, it slows down; causing it to continue to travel at a different direction as a result it deviates. In the case of homogeneous medium light travels along a straight line. Refraction is the bending property of light as it passes from one transparent medium to another. When light passes from a less dense to more dense medium, (for example passing from air into water), the light is refracted (or bent) towards the normal as shown in [Fig. 15.1]. The bending occurs because light travels slowly in a denser medium...
Unit and Dimensions (Part 1)
UNIT & DIMENSION (PART I) 1. INTRODUCTION: Physics is an experimental science and experiments require measurement of physical quantities. Measuring a physical quantity involves comparing the quantity with a reference standard called the unit of the quantity. Some physical quantities are taken as base quantities and other quantities are expressed in terms of the base quantities called derived quantities. This forms a system of base quantities and their units. 2. UNITS To measure a physical quantity we need some standard unit of that quantity. The measurement of the quantity is mentioned in two parts, the first part gives magnitude and the second part gives the name of the unit. Thus, suppose I say that length of this wire is 5 meters. The numeric part 5 says that it is 5 times of the unit of length and the second part meter says that unit chosen here is meter. 2.1 Fundamental and Derived Quantities The basic physical quantities, wh...
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