water column of height  7 cm. If refractive index of water is

  1. 1.269

  2. 1.286

  3. 1.259

  4. 1.310

Answers (1)
S Sayak

Since the number of waves formed in glass slab of thickness 6 cm is the same as the number of waves formed in water column of height 7 cm

\\\frac{\lambda _{glass}}{6}=\frac{\lambda _{water}}{7}\\ \frac{v_{glass}}{6f}=\frac{v_{water}}{7f}\\ \frac{v_{glass}}{6c}=\frac{v_{water}}{7c}\\ \frac{\mu _{water}}{6}=\frac{\mu _{glass}}{7}\\ \mu _{water}=\mu _{glass}\times \frac{6}{7}\\ \mu _{water}=1.52\times \frac{6}{7}\\ \mu _{water}=1.3 

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