Reflection of
Light 13.2
Karla Mendez and Shelby Bowen
Introduction

•

In this lesson we are going to talk about
what reflection is and the difference
between specular and diff...
Key Words

•
•
•
•

Reflection
Angle of incidence
Angle of reflection
Virtual image
Specular Reflection

•
•

Specular reflection is defined as light
reflected from a smooth surface at a
defined angle.
This...
Diffuse Reflection

•
•
•

Diffuse reflection is reflection off of rough
surfaces such as clothing, paper, and the
asphalt...
Diffuse Reflection

•

You can see that the the reflection of the
light hitting the rough surface causes
it to scatter in
...
What is the Law
of Reflection (flat mirrors)?
• Reflection is when a ray of light strikes a

•
•

•

plane mirror, the lig...
Key words on the
Law of Reflection

•
•
•
•
•

Angle of incidence
Angle of reflection
Incident ray
Reflection ray
“Normal”
What is the angle
of incidence?

•
•

Angle of incidence is the angle between a
beam incident on a surface and the
normal....
●
● The red line
represents the
incident ray
(sunlight)
● The black line
represents the
normal
● The angle
between the two...
What is the angle
of reflection?

•
•

•

The angle between a reflected ray and the
normal, drawn at the point of incidenc...
The distance between
the normal (dotted line)
and the reflected ray
(red line) is the angle of
reflection.
Images formed by flat
mirrors
-Whats an image?
❖A real image of an object produces the
same pattern of light as the object...
Virtual
The reason
why the
virtual image
looks lighter
is because
only 90% of
the original
image is
being
reflected by
the...
What’s in the
mirror?

•

•

When you look in the mirror you are looking
at a reversed you!
The image of your left is now ...
The baby’s reflection is
reversed. You can see that the
baby’s right side of its body is
reflected on the left and the lef...
Images Formed by flat
mirrors continued..

•
•
•

Mirrors can produce real and virtual
images by reflection.
A flat mirror...
Summary
● Specular reflection is defined as light
reflected from a smooth surface at a
defined angle.
● Diffuse reflection...
Summary
(Continued)

•

Reflection is when a ray of light strikes a
plane mirror
o

•

o

flat mirrors are the simplest fo...
Summary
(Continued)

•
•

Angle of incidence is the angle between a
beam incident on a surface and the
normal.
The angle b...
Summary
(Continued)

•
•

A real image of an object produces the
same pattern of light as the object does
somewhere in spa...
Summary
(Continued)

•
•

Mirrors can produce real and virtual
images by reflection.
A flat mirror only produces virtual i...
Questions?
Bibliography
All Things Reflected. (n.d.). Optics For Kids. Retrieved October 25, 2013,
from http://www.optics4kids.org/ho...
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Reflection13.2

  1. 1. Reflection of Light 13.2 Karla Mendez and Shelby Bowen
  2. 2. Introduction • In this lesson we are going to talk about what reflection is and the difference between specular and diffuse reflection of light. We will also be applying the law of reflection for flat mirrors and explain and describe images formed by flat mirrors.
  3. 3. Key Words • • • • Reflection Angle of incidence Angle of reflection Virtual image
  4. 4. Specular Reflection • • Specular reflection is defined as light reflected from a smooth surface at a defined angle. This is an example of specular reflection.
  5. 5. Diffuse Reflection • • • Diffuse reflection is reflection off of rough surfaces such as clothing, paper, and the asphalt roadway. Diffuse reflection originates from a combination of internal scattering of light. Diffuse reflection allows us to see most things around us. o Example: Light is diffusely reflected from a paper in many directions.
  6. 6. Diffuse Reflection • You can see that the the reflection of the light hitting the rough surface causes it to scatter in many different directions.
  7. 7. What is the Law of Reflection (flat mirrors)? • Reflection is when a ray of light strikes a • • • plane mirror, the light ray reflects off the mirror. Flat mirrors are the simplest form of a mirrors Reflection is a change in direction of the light ray. The law states that the angle of incidence is equal to the angle of reflection.
  8. 8. Key words on the Law of Reflection • • • • • Angle of incidence Angle of reflection Incident ray Reflection ray “Normal”
  9. 9. What is the angle of incidence? • • Angle of incidence is the angle between a beam incident on a surface and the normal. Line perpendicular to the surface at the point of incidence.
  10. 10. ● ● The red line represents the incident ray (sunlight) ● The black line represents the normal ● The angle between the two is called the angle of incidence
  11. 11. What is the angle of reflection? • • • The angle between a reflected ray and the normal, drawn at the point of incidence to a reflecting surface. Light reflects off a mirror at the same angle as it did when it (incident ray) hit the mirror. A mirror can only reflect 90% of incident light.
  12. 12. The distance between the normal (dotted line) and the reflected ray (red line) is the angle of reflection.
  13. 13. Images formed by flat mirrors -Whats an image? ❖A real image of an object produces the same pattern of light as the object does somewhere in space. ❖A virtual image is the apparent position from which a pattern of light reaches our detector, if we make the assumption that it has traveled from its source to the detector along a straight-line path.
  14. 14. Virtual The reason why the virtual image looks lighter is because only 90% of the original image is being reflected by the mirror. Real image
  15. 15. What’s in the mirror? • • When you look in the mirror you are looking at a reversed you! The image of your left is now on the right and your right is on the left. o Example: When you are brushing your teeth and you have a shirt on the says Hollister, in the mirror it will be backwards because a mirror reverses the virtual image (image in the mirror) from the original (real image).
  16. 16. The baby’s reflection is reversed. You can see that the baby’s right side of its body is reflected on the left and the left is on the right
  17. 17. Images Formed by flat mirrors continued.. • • • Mirrors can produce real and virtual images by reflection. A flat mirror only produces virtual images. The Law of Specular Reflection states that light reflecting from a plane mirror forms an angle to the NORMAL equal to the angle between the normal and the incident light.
  18. 18. Summary ● Specular reflection is defined as light reflected from a smooth surface at a defined angle. ● Diffuse reflection is reflection off of rough surfaces ○ clothing, paper, asphalt roadway ○ scattering of light ○ allows us to see most things
  19. 19. Summary (Continued) • Reflection is when a ray of light strikes a plane mirror o • o flat mirrors are the simplest form of mirrors reflection is a change of reflection in a light ray The law of Reflection states that the angle of incidence is equal to the angle of reflection
  20. 20. Summary (Continued) • • Angle of incidence is the angle between a beam incident on a surface and the normal. The angle between a reflected ray and the normal, drawn at the point of incidence to a reflecting surface.
  21. 21. Summary (Continued) • • A real image of an object produces the same pattern of light as the object does somewhere in space. o Example: You A virtual image is the apparent position from which a pattern of light reaches our detector o Example: Your reflection in the mirror
  22. 22. Summary (Continued) • • Mirrors can produce real and virtual images by reflection. A flat mirror only produces virtual images. o Example: The mirror in your bathroom
  23. 23. Questions?
  24. 24. Bibliography All Things Reflected. (n.d.). Optics For Kids. Retrieved October 25, 2013, from http://www.optics4kids.org/home/teachersparents/articles/thereflection-of-light/ Molecular Expressions Microscopy Primer: Light and Color - Reflection of Light: Interactive Java Tutorial. (1998, June 21). Molecular Expressions Microscopy Primer: Light and Color - Reflection of Light: Interactive Java Tutorial. Retrieved October 25, 2013, from http://micro.magnet.fsu.edu/primer/java/reflection Reflection of light. (2012, April 18). Science Learning Hub RSS. Retrieved October 25, 2013, from http://www.sciencelearn.org.nz/Contexts/Light-andSight/Science-Ideas-and-Concepts/Reflection-of-light

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