C172 TRNG FLC INITIATE EVASIVE MANEUVER IN RWY 32R TFC PATTERN TO AVOID CONFLICTING DEPING RWY 25 CORPORATE JET AT SBA.

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AS THE CHIEF INSTR AND I (CFI) TURNED DOWNWIND; THE TWR ASKED US TO MAKE A TIGHT PATTERN FOR RWY 15R. MY DOWNWIND LEG WAS A LITTLE WIDE SO I TIGHTENED THE PATTERN ENOUGH TO FLY MY NORMAL DOWNWIND TRACK. FROM THE RIGHT SEAT IN A RIGHT PATTERN; I COULD EASILY SEE A JET ROLLING DOWN RWY 25. AS THE JET ROTATED; I NOTICED THAT OR FLT PATHS WOULD INTERSECT. I ASSUMED THAT THE JET WOULD CROSS BENEATH ME; BUT IT WOULD STILL BE PRETTY DARN CLOSE. THEN I THOUGHT 'OH NO; I SHOULD HAVE TIGHTENED MY DOWNWIND LEG SOME MORE FOR SEPARATION.' AS THE JET'S CLIMB ALT INCREASED; I FELT LIKE THE TARGET OF AN INTERCEPT MISSILE AND TOOK EVASIVE ACTION. HOPING THAT THE JET WOULD MAINTAIN RWY HEADING TO AT LEAST 1000 FT; I TURNED LEFT (AWAY FROM THE ARPT) AND INITIATED A SHALLOW DSCNT. I FELT THAT I WAS DOING THAT RIGHT THING IF ATC WAS UNAWARE OF THE SIT. BUT WHAT IF ATC HAD ALREADY MADE PROVISIONS FOR SEPARATION? WHAT IF THE JET WAS INSTRUCTED TO MAKE A LOW ALT LEFT TURN IN ORDER TO AVOID ME? WITHIN MOMENTS AFTER DEVIATING; THE CHIEF INSTR TOOK OVER THE CTLS AND TURNED US BACK TO DOWNWIND. I HAD NO INTENTION OF FIGHTING OVER THE CTLS WITH HIM; BUT I WAS ABLE TO POINT OUT THE JET AS IT PASSED SLIGHTLY IN FRONT OF US AND OVERHEAD. AFTER LNDG; THE CHIEF PLT ASKED GND CTL IF THE JET HAD VISUAL CONTACT WITH US. THE CTLR SAID; 'UH; WE WILL HAVE TO CHECK THE TAPE.' ALTHOUGH HE WAS JUST ASKING OUT OF CURIOSITY; I DO NOT BELIEVE THAT WE WERE IN SIGHT. THE JET WAS FLING DIRECTLY INTO THE SUN AND HAD A VERY HIGH PITCH ATTITUDE. I DO NOT KNOW IF TWR NORMALLY ALLOWS JETS TO TKOF OF RWY 7/25 WHILE ANOTHER AIRPLANE IS APCHING THE EXTENDED CENTERLINE. WHATEVER THE CASE; I BELIEVE THAT THE CORRECTIVE ACTION WOULD HAVE BEEN TO HOLD THE JET FOR ANOTHER 8-10 SECS IN ORDER FOR ME TO CLR THE EXTENDED CENTERLINE OF THE TKOF RWY.