Concave and Convex!!

Today in physics class.. it was the usual calculations.. the usual wavelengths, frequencies and amplitudes.

I nearly slept in class because im not really a fan of calculations~ Orz

But then Mr Siah Pang Sing, our physic teacher, gave us some concave and convex lenses~

Normally, a student will just see through them or touch them for 10secs and they wud just hand over those lenses to the students at the back but.. Jared, my friend, isn't that "normal"

Why? i'll show u why -,-

these are concave lenses

LOL OK.. This one looks like our Chemistry teacher ~.~

these are convex lenses

W0000T! Okay, Please Don't Freak Out Now
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ROFLOLMAOROAR!!! FAIL