Consider the following aircraft : 1. Rafael 2. MiG-29 3. Tejas MK-1 How many of the above are considered fifth generation fighter aircraft?

Let's classify each aircraft by generation:

1. Rafael (Rafale): The Dassault Rafale is a French twin-engine, canard delta wing, multirole fighter aircraft. It is considered a 4.5 generation fighter aircraft, known for its advanced avionics, stealth features (reduced radar cross-section), and highly integrated systems. It is not a fifth-generation fighter.

2. MiG-29: The Mikoyan MiG-29 is a Soviet-designed twin-engine jet fighter aircraft. It is typically classified as a fourth-generation fighter aircraft, having entered service in the 1980s. It lacks the advanced stealth and sensor fusion capabilities of 5th generation aircraft.

3. Tejas MK-1: The HAL Tejas is an Indian single-engine, delta wing, light multirole fighter. The Tejas MK-1 is classified as a 4th generation (or 4+ generation) fighter aircraft. While efforts are on for an Advanced Medium Combat Aircraft (AMCA) which aims to be a 5th generation aircraft, Tejas MK-1 is not a 5th generation fighter.

Fifth-generation fighter aircraft are characterized by key features such as all-aspect stealth, high maneuverability, advanced avionics, sensor fusion, and integrated avionics. Examples include the F-22 Raptor, F-35 Lightning II, Su-57, J-20, and KF-21 (partially).

Therefore, none of the listed aircraft are considered fifth-generation fighter aircraft.