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

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

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

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?

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

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

How Images Are Formed in Concave Mirrors

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

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

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

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

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.

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.

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

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

Object Behind Focal Point Object in front of Focal Point

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

Chapter 23

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