An incident ray of light strikes a diamond at an angle of 45°. The index of refraction of air is 1.0003 and the index

of refraction of a diamond is 2.42.

What is the angle of refraction rounded to the nearest

whole number?

2°

17

19

45

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)