A light ray moving at a 54.3 deg
angle in water (n = 1.33) hits a
boundary with oil (n = 1.52). At
what angle is it refracted in the oil?
(Water n = 1.33, Air n = 1.00)
(Unit = deg)

Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)