CBSE Class 12-science Answered
a 60° prism has a refractive index of 1.5 Calculate the angle of incidence for minimum deviation , the angle of
emergence of light at maximum deviation and angle of maximum deviation.
Asked by Saranya | 14 Jun, 2018, 10:31: PM
Expert Answer
The formula relating refractive index, Angle of prism and angle of minimu deviation is
, where μ is the refractive index, A is angle of prism and Dm is minimum angle of deviation
by substituting A = 60º, μ=1.5 and solving for Dm we get, Dm = 37.2°.
Maximum angle of deviation occurs when incident angle i is 90°.
As shown in figure, angle of deviation δ is given by , δ = i + e - A ................(1)
also we have, r + r' = A ........................(2)
for maximum angle of deviation,
from eqn.(2), r' = A-r = 60 - 41.8 = 18.2º
to get angle of emergence e, we have
from eqn.(1), we get maximum angle of deviation, δ = 90+27.94-60 = 57.94 º
Answered by Thiyagarajan K | 15 Jun, 2018, 12:10: PM
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