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Let angle of incidence equal to I.
So angle of refraction will be I/2.
sin I/(sin I/2)=m. (Snell's law)
sin I =nsin I/2
But sin I =2sin I/2cosi/2
After substituting and simplifying,
We get:-
cos I/2=m/2
I/2=cos^-1(m/2)
I=2cos^-1(m/2)
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