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ICSE Class 10 Answered

pls ans fast
Asked by sgs040276 | 02 Jul, 2018, 07:23: PM
answered-by-expert Expert Answer

Ray OA incident normally on the boundary of water-air. Hence there is no refraction and no deviation.
 
Angle of incidence for ray OB is 38° which is less than critical angle, hence only refraction.
The angle of refraction is obtained from the definition of refractive index
begin mathsize 12px style fraction numerator sin space i over denominator sin space r end fraction space equals space fraction numerator sin begin display style space end style begin display style 38 end style over denominator sin begin display style space end style begin display style r end style end fraction space equals space 1 over mu space equals space 3 over 4 space semicolon space h e n c e space w e space g e t space r space equals space 55 degree space end style
Angle of incidence of ray OC is 50º, greater than critical angle, hence total internal reflection is taking place
Answered by Thiyagarajan K | 03 Jul, 2018, 03:24: PM

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