There are two other instances where a mirror of some sort is used. The Animated Series had him using a mirror and the comics had him bouncing the heat vision off of a curved piece of metal that was taken from the spacecraft her was sent to Earth in. image from comic of Clark shaving Image from Animated Series
CLARK: No. I'm just worried I'm a jinx.
JONATHAN: A jinx?
CLARK: Yeah. Let's face it, ever since she's known me, Lois's been kidnapped, frozen, pushed off buildings, almost stabbed, poisoned, buried alive and who knows what else, and it's all because of me.
-"Contact" (You're not her jinx, you're her blessing.)
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