14.3 Curved MirrorsDate, Section, Pages, etc.

Mr. Richter

Agenda

Warm-Up Review HW Introduction to Curved Mirrors Notes:

Mirror and Lens Terminology Concave Spherical Mirrors Convex Spherical Mirrors Parabolic Mirrors

Tests Back Time Permitting

Objective(s): Students will be able to…

Predict and describe the reflected image in a curved mirror relative to distance from the mirror.

Distinguish between real and virtual images. Describe how parabolic mirrors differ from spherical

mirrors.

Warm-Up:

Where do we see curved mirrors in real life? What do they do that is helpful?

Curved Mirrors

Where do we see them? Driveways, spoons,

dressing tables, passenger sides of cars, etc.

What do they do? Magnify or shrink

images Distort images Project images Brighten or dim images

Terminology for Mirrors and Lenses

Terminology

Focal point: the point at which reflected or refracted rays of light converge (meet)

Concave: inwardly curved Convex: outwardly curved Real image: image formed when rays of light

actually intersect at a single point Virtual image: image formed by rays of light that

only appear to intersect

Concave Spherical Mirrors

Concave Spherical Mirrors

Concave mirrors can display both real and virtual images.

The type of image displayed depends on the object’s position relative to the focal point. (see the following…)

Concave Spherical MirrorsObject Closer than Focal Point

When the object is closer than the focal point:

The image is virtual The image is

magnified

Concave Spherical MirrorsObject Farther than Focal Point

When the object is farther than the focal point:

The image is real, and can be projected onto another surface

The image is shrunken

Concave Spherical MirrorsObject at the Focal Length

When the object is at the focal length:

The image is created directly over the object!

The image is unseen.

Convex Spherical Mirrors

Convex Spherical Mirrors Objects appear smaller

(think your passenger- side mirror on your car)

Wider area can be seen (like in a convenience store, to catch you delinquent kids)

Images are only upright and only virtual

Parabolic Mirrors

Parabolic Mirrors

With spherical mirrors, the closer the image gets to the edge of a mirror, the more the image is distorted.

This is called spherical aberration.

Parabolic Mirrors

Parabolas focus every incoming wave to one focal point.

This eliminates the spherical aberration.

Paraboloid shapes are used for satellite dishes, solar panels, telescopes, etc.

RecapThis one’s important!

Type of Mirror

Image and Details Example

Flat Virtual image is reflected. Same size as object.

Standard bathroom mirror. Ballet studio.

Concave Spherical

•If object closer than focal length, virtual image is magnified and upright.•If object is farther than focal length, real image is inverted.•If object is at focal length, real image is projected onto the object.

Dressing table mirror.

Convex Spherical

Virtual image is smaller than original.

Passenger side mirror.

Parabolic Focuses all waves into one point. Virtual Image.

Solar panel.

Types of Mirrors and Images

Homework

p. 551 #23-27, 30, 31