PE = KE demo
139
reflection (normal line and angles)
157
reflection 2 (mirror/obj. movement)
173
reflection 3 (mirror, object, image)
180
total internal reflection
200
refraction (refractive index)
220
refraction 2 (shallow and deep water)
240
refraction 3 (lens)
261
properties of waves
294
electromagnetic waves
306
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321
other (dont close)
322
338
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