A) \[\frac{5}{3}\]
B) \[\frac{5}{4}\]
C) \[\frac{16}{15}\]
D) \[1.5\]
Correct Answer: A
Solution :
Number of waves of wavelength contained in thickness \[t\] is given by, \[n=\frac{t}{\lambda }\] \[\therefore \] \[\lambda \propto \frac{1}{\mu }\] \[\Rightarrow \] \[n\propto t\mu \] \[\therefore \] \[{{t}_{g}}{{\mu }_{g}}={{t}_{w}}{{\mu }_{w}}\] \[\Rightarrow \] \[4\times {{\mu }_{g}}=5\times (\frac{3}{4})\]
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