Light travels from air into a glass block with an angle of incidence in air of 40.0°. The block is then submerged in a liquid and the light now travels from air, through the liquid and into the glass. When the angle of incidence in the liquid is 18.0°, the angle of refraction in the glass is the same as when the light entered the glass from air. Determine the index of refraction of the liquid.

Light travels from air into a glass block with an angle of incidence in air of 40.0°. The block is then submerged in a liquid and the light now travels from air, through the liquid and into the glass. When the angle of incidence in the liquid is 18.0°, the angle of refraction in the glass is the same as when the light entered the glass from air. Determine the index of refraction of the liquid.