Sat September 22, 2012 By: Rahul Kumar Yadav
refraction=sini/sinr .............(1)
and also
refraction=speed of light in medium 1/ speed of light in medium 2 ............(2)
but if incident light with normal making an angle 0 degree

Refraction by medium

Expert Reply
Mon September 24, 2012
what u r writing as refraction is refractive index
and when the incident light is parallel to the normal, the incident angle and refracted angle is zero which mean it did not undergo any refraction but
is just tranmitted.
hence the formula is not valid in that case.
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