Three isosceles right angled prisms of refractive indices μ 1 , μ 2 and μ 3 are joined together so that the faces of the middle prism are in contact each with one of the outside prisms. If the ray passes through the composite block undeviated, then value of 
+ 
– 
is–
Text Solution
Verified by ExpertsThe correct answer is:
D
r 1 + r 2 = 90 0 r 3 + r 4 = 90
0 r 5 + r 6 = 90
0 r 7 = 90
0 – i
Use snell's law
sin i = μ 1 sin r 1
μ 1 sin r 2 = μ 2 sin r 3
μ 2 sin r 4 = μ 3 sin r 5
μ 3 sin r 6 = sin r 7
Using these all equation we compare 
+ 
– 
= 1
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