Sources and propagation of light
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VD5.1.2.1_b
Straight-line propagation of light
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VD5.1.3.1_a
Transparency and opacity of various solid bodies
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VD5.1.4.1_a
How a shadow is formed
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VD5.1.2.3
How an image is formed by a pinhole camera
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VD5.1.4.2_a
Formation of umbra and penumbra
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VD5.1.2.4
Inverse square law for light
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