A ray of light is incident at an angle of 30o o... - WAEC Physics 1991 Question
A ray of light is incident at an angle of 30o on a glass prism of refractive index 1.5. Calculate the angle through which the ray is minimally deviated in the prism. (The medium surrounding the prism is air)
A
10.5o
B
19.5o
C
21.1o
D
38.9o
correct option: a
n = (\frac{sin i}{sin r})
sin r = (\frac{30^o}{n})
sin r = (\frac{0.5}{1.5})
sin r = 0.3333
r = 19.5o; Deviation 30 - 19.5 = 10.5o
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