Optics 4 Question 10
10. A given ray of light suffers minimum deviation in an equilateral prism $P$. Additional prisms $Q$ and $R$ of identical shape and of the same material as $P$ are now added as shown in the figure. The ray will suffer
$(2001,2 M)$
(a) greater deviation
(b) no deviation
(c) same deviation as before
(d) total internal reflection
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Solution:
- Figure (a) is part of an equilateral prism of figure (b) as shown in figure which is a magnified image of figure (c). Therefore, the ray will suffer the same deviation in figure (a) and figure (c).
(a)
(b)
(c) NOTE Questions are often asked based on part of a prism. For example, section shown in figure (a) is part of a prism shown in figure (c).
