Question

AT WHAT ANGLE MUST A RAY OF LIGHT INCIDENT ON THE SURFACE OF A LIQUID BE REFRACTED AT 30 DEGREE
REFRACTIVE INDEX =1.36

Answer 1

$$\begin{gathered} Dearstudent, \\ \mu =\frac{\sin i}{\sin r} \\ 1.36=\frac{\sin i}{\sin 30} \\ \sin i=\frac{1}{2}\times 1.36 \\ \sin i=0.68 \\ i={\sin }^{-1}0.68 \\ i=42.{84}^o \\ Solightmustbeincidentat42.{84}^o \\ Regards \end{gathered}$$