1. Last of the information for the Final!
Chapter 23
Last of the information for the Final!

2. Section Objectives 23.1
Compare plane mirrors, concave mirrors, and convex mirrors.
Describe the images formed by concave and convex

3. Plane Mirror Plane Mirrors have a flat surface.
Light reflects off a mirror because it can not pass through the surface.
The reflection of an object in a plane mirror is right side up and the same size as the object, but reversed left to right.
Plane mirrors form virtual images. A virtual image is an image through which light does not travel

4. S.A.L.T.???
S- Size: compared to original object is it same size, smaller or bigger?
A- Attitude: which way the image is oriented compared to the original object (upright or inverted).
L- Location: location of the image (in front or behind the mirror).
T- Type: is the image a real image or virtual image?

6. Plane Mirror--SALT
SIZE:
ATTITUDE:
LOCATION:
TYPE:

7. Concave Mirrors A concave mirror is curved inward.
They can produce both a virtual or a real image.
A real image is an image through which light passes.
The point at which all light rays meet is called the focal point.
A concave mirror will only produce a virtual image if the object is located in front of the focal point.
Examples: automobile headlights, flashlights, Make-up mirrors
Video 1
Video 2

8. How Images Are Formed in Concave Mirrors

9. Concave Mirror--SALT
SIZE:
ATTITUDE:
LOCATION:
TYPE:

10. Convex Mirror
A convex mirror curves outward. The object is virtual and appears smaller and upright.
Convex mirrors spread out light; allowing the mirror to show a wide angle of view.
Examples: Used in store aisles, hazardous traffic intersections, side mirrors on cars and buses.
Video 1

11. Convex Mirror--SALT
SIZE:
ATTITUDE:
LOCATION:
TYPE:

12. Mirrors – reflect light
Types of Mirrors
Images Formed
Virtual or Real
Direction of Image
Plane / Flat
Virtual
Upright/opposite
Convex
(Curves outward)
Upright/smaller
Concave
(curves inward)
Object – Focal- Mirror
Real
Upside down
Focal- Object- Mirror
Upright

13. Lenses
Lens – an object made of transparent material that has one or two curved surfaces that can refract or bend light.
The curvature and thickness of a lens affect the way it refracts light.

14. Concave Lens
A concave lens is curved inward at the center (thinnest) and the thickest part at the outside edges.
The light rays are spread out.
Forms a small, upright virtual image.
Concave lenses cure nearsightedness when an eyeball is too long
Examples: a peep hole in a door,
found in viewfinders
of cameras, eyeglasses,
telescopes.

15. Concave Lens-SALT
SIZE:
ATTITUDE:
LOCATION:
TYPE:

16. Convex Lens
A convex lens is curved outward at the center and is thinnest at the outer edge.
Convex lenses form either real or virtual images.
If the object is located between a convex lens and its focal point it forms an enlarged virtual image
If the object is located behind the focal point, it forms a smaller real image
The real images is upside down.
Example; microscopes, magnifying glasses, eye glasses.
Convex lenses can be used to correct farsightedness when an eyeball is too short

17. Object Behind Focal Point Object in front of Focal Point

18. Convex Lens-SALT
SIZE:
ATTITUDE:
LOCATION:
TYPE:

19. Chapter 23

20. Convex (curves outward)
Lenses – refract light
Types of Lenses
Images Formed
Virtual or Real
Direction of Image
Concave
(Curves inward)
Virtual
Upright/smaller
Convex (curves outward)
Object – Focal- Lens
Real
Upside down
Convex
(curves outward)
Focal- Object- Lens
Upright