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PAGE No., DATE, Define the following terms,, I Angle of îocidence, The, angle ketween incident, is icalled angle of incidence., Kay, and Dom, 四, A Angle of Refraction :-, The angle betawe en refracted ray and, Lin called angle of refrachonpa, normal., I Gtancing Angle i-, The tangle made by incident ray with the, Sreflecting surface @ interface is called glancing, angle., Respective, e angleof deviahion., ang le between incident, and, is called the angle, AThe, reflected, ray, O refracted ay, of deviation.

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PAGE No., DATE, Befine, i Relative Refrachive index., the following terms-, of speed of Light in firot medium t, specd of Light in second medium is called, second medium with, Ratio, relative refractive index of, respect, to, first medium, speed af LightE in medium !, N2= speed of Light in medium 2, Then refractive inder of mediam 2, is qiven by., cwith, respect, to medium, N2, A Absolute refractive index, IRatio of speed of light in yacium to i speed of, tight in e given medium is called absolute refractive, :-, index., C, WWhere, C= speed of light in vaccum., The absolute, but relative R.f, R.f of any medium is alwaysL, be < 71. an, may, The, speed of light in air or, vacum is, taken as, same for all practical purpose