# Report in Physics

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Leanne Gilline Oliva Report in Physics (4th qtr.) Refractive index, also called index of refraction, measure of the bending of a ray of light when passing from one medium into another. * A transparent substance (optical medium) is a dimensionless number that describes how light, or any other radiation, propagates through that medium. Waves slow down, or are refracted, when they pass through a dense medium. Light that enters glass slows down to 65% of the speed of light in vacuum. The index of refraction is always greater than 1 because c is the maximum value of the speed of light anywhere. INVERSE relationship between SPEED OF LIGHT in a medium and INDEX OF REFRACTION of the medium. Thus , LIGHT slows more as the index of refraction increases. EXAMPLE: 1. The speed of light in an unknown medium is measured to be 2.76 x 108 m/s. (a) What is the index of refraction of the medium? (b) Does it match any of the materials listed in yourTable? Solution: (a) | The index is found to be n = c/v = (3.00 x 108 m/s)/(2.76 x 108 m/s) = 1.09. | (b) | This does not equal any of the indices of refraction listed in the table. It is closest to air, which suggests it is some slightly denser gas. 2. If light travels through a liquid at 2.50 x 108 m/s, what is the index of refraction (n) of that liquid? | Glasses can be classifies based on their refraction indices and ability to disperse light. Flint glass has high refractive index while a crown glass has low index. When light travels from one medium to another, the medium through which it travels faster is called RARER MEDIUM. DENSER MEDIUM through which it travels slower. Law of Reflection The two laws of reflection are as follows: 1. The incidenct ray, the reflected ray, and the normal to the reflecting interface at the point of incidence all lie in the sameplane. 2. The angle of