Optics 4 Question 6
6. The graph between angle of deviation ( $\delta$ ) and angle of incidence $(i)$ for a triangular prism is represented by
(2013 Main) (a)
(c)
(b)
(d)
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Solution:
- We know that the angle of deviation depends upon the angle of incidence. If we determine experimentally, the angles of deviation corresponding to different angles of incidence and then plot $i$ (on- $X$-axis) and $\delta$ (on- $Y$-axis), we get a curve as shown in
figure.
Clearly if angle of incidence is gradually increased, from a small value, the angle of deviation first decreases, becomes minimum for a particular angle of incidence and then begins to increase.
