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In a thick glass slab of thickness l, and refractive index n1 a cuboidal cavity of thickness 'm' is carved as shown in figure and is filled with a liquid of RI n2 (n1 > n2). The ratio l/m, so that shift produced by this slab is zero when an observer r4 observes
an object B with paraxial rays is

a
n1−n2n2−1
b
n1−n2n2n1−1
c
n1−n2n1−1
d
n1−n2n1n2−1

detailed solution

Correct option is B

Shift =(l−m)1−1n1+m1−1n2=0

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