Refractive index of space is 1
Refractive index of crown glass is approximately 1.52
Since the ligth beam hits the window at an angle of 30 degrees
Angle of incidence is 60 degrees
As the refreactive indices of media are known and the angle of incidence is given we can calculate the angle of refraction using the snell's law of refraction.
Snell's law-
is the angle of refraction
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