A tank containing methanol has walls $2\mathrm{.}50$ cmcm thick made of glass of refractive index $1\mathrm{.}550.$ Light from the outside air strikes the glass at a $41\mathrm{.}341\mathrm{.}3$ angle with the normal to the glass. Find the angle the light makes with the normal in the methanol. Methanol has a the refractive index of $1\mathrm{.}329.$

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Part B

The tank is emptied and refilled with an unknown liquid. If light incident at the same angle as in part $($a$)$ enters the liquid in the tank at an angle of $20\mathrm{.}220\mathrm{.}2$ from the normal, what is the refractive index of the unknown liquid