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Reflection of Light
Slide 2
• Luminous objects – generate their own
light (the sun)
• Illuminated objects – reflect light (the
moon)
• Line of Sight – a line from an object or
image to your eyes (light from the object
travels along this line to your eyes)
Definitions
Slide 3
Line of Sight
• Both luminous &
illuminated objects
emit/reflect light in
many directions.
• Your eye sees only
the very small
diverging cone of
rays that is coming
toward it.
Slide 4
Rays of Light
• Incident Ray – leaves
the object and strikes
the mirror
• Reflected Ray – leaves
mirror and strikes your
eye
• The reflected ray is on
the line of sight from
the image to your eye.
Slide 5
Law of Reflection
• Angle of incidence equals angle
of reflection.
Slide 6
Law of Reflection
• Normal – line
perpendicular to the
mirror surface
• Angle of incidence –
angle between
incident ray and
normal
• Angle of reflection –
angle between
reflected ray and
normal
Slide 7
Law of Reflection Animation
qi = qr
Slide 8
Diffuse Reflection
Slide 9
Diffuse Reflection
Slide 10
Wet Road Glare
• Driving at night on a wet roadway results in
an annoying glare from oncoming
headlights.
Slide 11
Observing an Image
• An image is a position in
space from which all
reflected light appears
to diverge.
• Image formed by a plane
mirror is called a virtual
image.
• Virtual images are
formed in regions where
there is actually no light
Slide 12
Image Location
Slide 13
Image Formed By Plane Mirror
• Image is virtual.
• Image is located
as far behind the
mirror as the
object is in front
of the mirror.
Slide 14
How Big Must the Mirror Be?
Slide 15
Distance from Mirror
Irrelevant
Slide 16
Right Angle Mirror
Slide 17
Right Angle Mirror
• Formation of primary
and secondary images
Slide 18
Kaleidoscope
• Angles smaller than
90o produce more
than 3 images
Slide 19
Kaleidoscope Applets
• Hinged Mirror Applet
• Image Formation Applet
Reflection Applets
• Plane Mirror Image Applets
• Double Mirror Images
• Hinged Mirror Applet
• Rainbow Applets
Law of Reflection
Curved Mirrors
• Angle of Incidence is
equal to the angle of
reflection
Converging Mirror
• A series of flat mirrors
can be arranged to
reflect parallel light
through a single point.
• Increasing the number
of flat mirrors causes
the shape to more
closely approximate a
parabola and causes the
reflected light to
converge in a smaller
area.
Parabolic vs Spherical
• Close to the axis of
the mirror, the
parabola and the
circle are almost
the same shape.
• Farther from axis
the parabola
flattens out.
• It is easier and
less expensive to
make spherical
mirrors.
Types of Curved Mirrors
• A concave mirror is
silvered on the inside of
the sphere.
• A concave mirror is also
called a converging mirror
because it converges
parallel light.
• A convex mirror is
silvered on the outside of
the bowl.
• A convex mirror is also
called a diverging mirror
because it diverges
parallel light.
Concave Mirror Terms
• Axis
• Center of Curvature
• Radius of Curvature
• Focus
• Focal Length
Three Useful Rays
• Ray parallel to the
axis reflects through
the focus.
• Ray through the
focus reflects
parallel to the axis.
• Ray through the
center of curvature
reflects back on
itself.

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reflection.ppt

  • 2. Slide 2 • Luminous objects – generate their own light (the sun) • Illuminated objects – reflect light (the moon) • Line of Sight – a line from an object or image to your eyes (light from the object travels along this line to your eyes) Definitions
  • 3. Slide 3 Line of Sight • Both luminous & illuminated objects emit/reflect light in many directions. • Your eye sees only the very small diverging cone of rays that is coming toward it.
  • 4. Slide 4 Rays of Light • Incident Ray – leaves the object and strikes the mirror • Reflected Ray – leaves mirror and strikes your eye • The reflected ray is on the line of sight from the image to your eye.
  • 5. Slide 5 Law of Reflection • Angle of incidence equals angle of reflection.
  • 6. Slide 6 Law of Reflection • Normal – line perpendicular to the mirror surface • Angle of incidence – angle between incident ray and normal • Angle of reflection – angle between reflected ray and normal
  • 7. Slide 7 Law of Reflection Animation qi = qr
  • 10. Slide 10 Wet Road Glare • Driving at night on a wet roadway results in an annoying glare from oncoming headlights.
  • 11. Slide 11 Observing an Image • An image is a position in space from which all reflected light appears to diverge. • Image formed by a plane mirror is called a virtual image. • Virtual images are formed in regions where there is actually no light
  • 13. Slide 13 Image Formed By Plane Mirror • Image is virtual. • Image is located as far behind the mirror as the object is in front of the mirror.
  • 14. Slide 14 How Big Must the Mirror Be?
  • 15. Slide 15 Distance from Mirror Irrelevant
  • 17. Slide 17 Right Angle Mirror • Formation of primary and secondary images
  • 18. Slide 18 Kaleidoscope • Angles smaller than 90o produce more than 3 images
  • 19. Slide 19 Kaleidoscope Applets • Hinged Mirror Applet • Image Formation Applet
  • 20. Reflection Applets • Plane Mirror Image Applets • Double Mirror Images • Hinged Mirror Applet • Rainbow Applets
  • 21. Law of Reflection Curved Mirrors • Angle of Incidence is equal to the angle of reflection
  • 22. Converging Mirror • A series of flat mirrors can be arranged to reflect parallel light through a single point. • Increasing the number of flat mirrors causes the shape to more closely approximate a parabola and causes the reflected light to converge in a smaller area.
  • 23. Parabolic vs Spherical • Close to the axis of the mirror, the parabola and the circle are almost the same shape. • Farther from axis the parabola flattens out. • It is easier and less expensive to make spherical mirrors.
  • 24. Types of Curved Mirrors • A concave mirror is silvered on the inside of the sphere. • A concave mirror is also called a converging mirror because it converges parallel light. • A convex mirror is silvered on the outside of the bowl. • A convex mirror is also called a diverging mirror because it diverges parallel light.
  • 25. Concave Mirror Terms • Axis • Center of Curvature • Radius of Curvature • Focus • Focal Length
  • 26. Three Useful Rays • Ray parallel to the axis reflects through the focus. • Ray through the focus reflects parallel to the axis. • Ray through the center of curvature reflects back on itself.