Light Light Transparent Materials Light Energy generated by

Light

Light & Transparent Materials � Light = � Energy generated by � Transparency › depends on › atoms act › resonance occurs �energy can be OR and as light

Light & Transparent Materials (cont) � Glass › › vibration of UV in UV range � of electrons become �atom holds on to �atoms with one another �produces �therefore, glass › visible light has �energy held for �energy chance for as transmitted light

Light & Transparent Materials (cont) � Time delay from energy transparent material › In and of through , light travels @ � Infrared › Frequencies › Vibrates › warms

Opaque Materials � Absorbs light passes thru � Any atoms are turned into = energy ; given by light to › Materials become � Metals › › Energy › free to wander to other atoms as energy ->

Opaque Materials (cont) � Atmosphere › Transparent to › Opaque to

Shadows � Ray: › Light on an object, some � Shadow: › › shadows produced by › Umbra: › Penumbra: �Some of the light is �Possibly caused by &

Shadows (cont) � See Figure 27. 12 & 27. 13 p 413 � Water › shadows also occur when › Light travels at depending on �Temp , density closer to

Polarization � Light waves = � Polarized: › can be � and (vertical structures) or (horizontal structures) of light wave has › Polarized light: › non-polarized light: � Light passes thru , but not if › See figure 27. 18 if axes are

Polarized Light & 3 -D viewing � 3 -D › Both eyes give › Each eye � Polarization axes are › Image is › Polarizing eyeglasses with › Each eye sees �Brain interprets › Optical illusions
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