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How are rays used?
to model the movement of a light wave, they predict how light travels, create shadows, reflects, and refracts
Incident rays
when light comes from a source
What happens when incident light strikes a transparent object?
the rays transmit easily
What happens when incident light strikes a translucent object?
only some rays pass through, so you cannot see what’s behind it
What happens when incident light strikes an opaque object?
no light can pass through, the rays are either absorbed or reflected
Shadows
opaque things prevent light, so an umbra forms, if the light is only partially prevented, it makes a penumbra