the ray model of light - science to a...
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The Ray Model of Light
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Light and Matter• Light is represented as straight
lines called rays. • Ray diagrams are drawings that
show the path that light takes. • Each ray ends with an arrow to
indicate the direction of travel.
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Light and Matter• Ray diagrams explain brightness. i.e. more rays that reach your eyes, the brighter the object appears
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Light and Matter• Ray diagrams are used to explain what
happens when light strikes an object. • Light travels in straight lines until it
strikes something. • Material have different properties which
affects what happens when light strikes them
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Light and Matter• Transmit - Light passes through them.
Example: Clear glass • Absorb – Light is absorbed by the
object and turned into heat • Reflect – Light bounces off the object.
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Light and MatterThe properties of materials can then be
further classified • Transparent materials, such as clear
glass or clear plastic, transmit light freely.
• Transparent materials absorb and reflect very little light. Example: a clear window
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Light and MatterTranslucent materials transmit some
light, but not enough to see through the material clearly.
Example: A frosted window pane. Some light can pass through.
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Light and Matter• Opaque objects absorb and reflect light,
but they do not transmit it
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Flat Mirrors and Reflections• Mirrors- smooth surfaces of glass with
a thin reflective film
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Incident ray
Reflected ray
Angle of incidence
Angle of reflectionNORMAL
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• original ray of light that strikes a mirror plane is called the incident ray
• the ray that bounces and strikes your eye is the reflected ray
•the normal is the line perpendicular to the mirrors surface
Reflection terms
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• the angle of incidence lies between the incident ray and the normal
• the angle of reflection lies between the reflected ray and the normal
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Complete the reflection
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Complete the reflection
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Complete the reflection
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Reflection of light• all objects that do not reflect an image
still reflect light. • Everything you can see is reflecting light.
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Reflection of light• light rays reflect on an uneven
surface are scattered in different directions (diffuse reflection)
• results in no bright spots or flashing reflections