Light — Science & Magic, 6th Edition

6 LIGHT: THE BEGINNING

those subjects with reputations for maximum diculty: metal, glass, white-

on-white, and black-on-black. Notice, however, that, although we’ve done

this in almost every case, we weren’t able to do it in absolutely every one of

them.

e “invisible light” exercise in Chapter 6, for example, is pretty dicult

for most beginners. Some students may also nd the secondary background

behind the glass of liquid in Chapter 7 to be beyond the limit of their

patience. For this reason, if you nd anything in this book that you haven’t

already done with your own hands and eyes, we strongly encourage you to

try it yourself before deciding whether it is appropriate to the skills of your

students.

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