No wonder when we come to class we all look so forlorn. Did he reveal the same. And now we have to learn them all On threat of F's and shame. Light travels in straight lines, that is unless somehow it's turned. But that's quite eas'ly learned.
Refraction is the bending which is caused by changing speed.
When slowing down the light bends 'toward the normal' as they say. Fa, la, la, etc. Sing a song of bad transistors. Fill the lab with amplifiers Fa, la, la, etc. Electronics is a pain.