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number 13 suppose you have an unknown clear substance immersed in water and you wish to identify by finding its index of refraction you arrange to have a beam of light entered at an angle 45 degrees and you observe the angle of refraction to be 40.3 what is the index of refraction and the likely identity all right so just pretend here for two seconds right that you have you got water i donamp;#39;t you know itamp;#39;s a little confusing you got a container of water and pretend you just have i donamp;#39;t know like some kind of a a substance here or something okay so you arrange a light beam all right to enter this well letamp;#39;s not do this letamp;#39;s do it like this letamp;#39;s not do a circle because that that creates its own complications letamp;#39;s pretend you have you arrange a light beam all right to enter this unknown substance here at an angle of 45 degrees relative to the normal okay so in other words this is 45 and you then observe that the refracted ray now
