Solve the given question:
Question: A glass plate whose index of refraction is 1.45 is immersed in a liquid. The surface of the glass is inclined at an angle of 54.0° with the vertical. A horizontal ray in the glass is incident on the interface. When the liquid is a certain alcohol, the incident ray arrives at the interface at the critical angle.
Part A- What is the index of refraction of the alcohol?
If possible just a brief explanation how you got the answer? Thanks in advance.