1.

How can you determine the value of I when r =90^(@)

Answer»

Solution :We can determine the value of the critical angle as follows :
`""_(1)n_(2)=(SIN i)/(sin r)`
For total internal reflection , i= critical angle r=`90^(@)` (SINCE, sin `90^(@)`=1)
Extra question
`""_(1)n_(2)=(sin i)/(sin 90^(@))=sin i(therefore SIN90^(@)=1)`


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