Question text
21 A ray of light is incident on a plastic block in air, at an angle of incidence i. The refractive index of the plastic is n. The light ray refracts along the plastic-air boundary when it reaches X. X 49° NOT TO SCALE 41° i plastic block incident ray Which equation is correct? A sin i = sin 41° / n B sin i = n / sin 49° C sin i = n × sin 41° D sin i = n × sin 49°
21 A ray of light is incident on a plastic block in air, at an angle of incidence i. The refractive index of
the plastic is n.
The light ray refracts along the plastic-air boundary when it reaches X.
X
49° NOT TO
SCALE
41°
i
plastic block
incident
ray
Which equation is correct?
A sin i = sin 41° / n
B sin i = n / sin 49°
C sin i = n × sin 41°
D sin i = n × sin 49°
Select your answer: