Answer to Question #24352 in Optics for nagaraju
sin (15 deg) = n*sin(60 deg)
It is then deviated by 55 degrees, so it is incident on the output surface at
n*sin(5 deg) = sin(alpha),
where alpha is the sought-for emergence angle.
alpha = arcsin( sin(5 deg) * sin(15 deg) / sin(60 deg) ) = 1.493 degrees.
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