A) green
B) indigo
C) violet
D) red
Correct Answer: D
Solution :
\[\operatorname{Apparent} depth =\,\,\frac{\operatorname{Re}al\,\,depth}{\mu }\] As, \[\mu =A+\frac{B}{{{\lambda }^{2}}}\] (Cauchy?s relation) \[\mu \] is least for red and red have maximum wavelength.
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