4th mcq

Asked by lovemaan5500 | 6th Jan, 2018, 07:23: AM

Expert Answer:

When the angle of incidence is critical angle, angle of refraction is 90°.
Hence
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 c end style over denominator sin begin display style space end style begin display style left parenthesis end style begin display style pi end style begin display style divided by end style begin display style 2 end style begin display style right parenthesis end style end fraction space equals space 2 over 3 sin space c space equals space 2 divided by 3 end style
 
i is angle of incidence, r is angle of refraction/emergence

Answered by  | 7th Jan, 2018, 01:01: PM

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