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Fr hot , wli He wll ext the pmtm medett 7 GS nal.ss

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Concept:- here we use the Snell's law and properties of geometry to find the angle, hormal amgle f refrachon is 90 So Bs Or Sivn 93 Sinao 3 4 4 49.8 Os65 2 Snels la> 1 55 Sinづ 02t 01- 90***************************************************************************************************
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