A) \[\frac{3}{\sqrt{7}}\]
B) \[3\]
C) \[\frac{\sqrt{7}}{3}\]
D) \[\sqrt{7}\]
Correct Answer: B
Solution :
: Here, Refractive index of water, \[{{n}_{w}}=\frac{4}{3}\] \[\sin C=\frac{1}{{{n}_{w}}}=\frac{1}{\left( \frac{4}{3} \right)}=\frac{3}{4}\] \[\therefore \] \[\tan C=\frac{3}{\sqrt{7}}\] From figure, \[\tan C=\frac{R}{\sqrt{7}}\] Equating (i) and (ii), we get \[\frac{3}{\sqrt{7}}=\frac{R}{\sqrt{7}}\] or \[R=3cm\]You need to login to perform this action.
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