Do Now:  At the interface between two materials, a light ray is at an angle of incidence of 45º on a side with an index of refraction of The light is at an angle of º on the other side of the interface. What is the index of refraction on the other side?

Extra Credit:  Take your quiz home and correct your mistakes. Turn it in on Monday and half of the points will be added to your quiz grade (ex. If you got a 60, you would get an 80) if all work is correct

Do Now (5/10/12) (4 min): 1. What are some things you know about mirrors? 2. What happens when you go into a House of Mirrors?

Mirrors 5/6/11

Plane Mirror  A flat, smooth surface from which light is reflected  *the Law of Reflection applies

Plane Mirror Images  Produce virtual images  Virtual images: form in locations where light does not actually reach.  left-right reversal  upright

Plane Mirror Images  d i = image distance  d o = object distance  h i = image height  h o = object height

Example:  If Suzie stands 3 feet in front of a plane mirror, how far from the mirror will her image be located?

Curved Mirrors  spherical mirrors: mirrors that have a spherical shape.  Concave: mirror on the inside of the sphere  Convex: mirror on the outside of the sphere.

Concave  f=focal point  C=radius of curvature

The Mirror Equations  M= magnifcation

Example:  d i = 10 cm  d o = 20 cm  f=?

Practice:  Complete the first two short answer and the first 7 problems  After, you may work on your next art piece

Practice:  Complete the first two short answer and the first 7 problems  After you may work on quiz corrections

Do Now: 5 min  f= 10 cm  d o = 20 cm  d i =?

Curved Mirrors  Concave mirrors can produce real images (as well as virtual images).  Real image: light actually passes through the image location.

Graphical Method of Finding the Image  An incident ray traveling parallel to the principal axis will pass through the focal point upon reflection.the principal axisfocal point  An incident ray passing through the focal point will travel parallel to the principal axis upon reflection.focal pointthe principal axis

Step-by-Step Method for Drawing Ray Diagrams 1. From the top of the object draw two incident rays traveling towards the mirror: Ray 1 : passes through the focal point on the way to the mirror Ray 2: travels parallel to the principal axis Ray 2 Ray 1

Step 2:  Once these incident rays strike the mirror, reflect them according to the two rules of reflection for concave mirrors. Extend the rays past their point of intersection.

Step 3:  Mark the image of the top of the object.

Step 4:  Fill in the image.  If the bottom of the object lies upon the principal axis, the image of this point will also lie upon the principal axis.

Ray Diagram for Virtual Image

Ray Diagram for Object at Focal Point  Image is not formed

Practice:  Complete one side of the Curved Mirror worksheet

Do Now:  Draw a ray diagram and locate the image: CF

Pop Quiz:  Copy the following diagram exactly onto your paper.  Draw a ray diagram and locate the image: C F

Single Mirror Properties dodo didi mimage d o >CC>d i >fReduced, inverted Real C>d o >fd i >CEnlarged, inverted Real f>d o (negative)EnlargedVirtual Draw ray diagrams on both sides; label image characteristics from chart on one side

Practice:  Complete one side of the Curved Mirror worksheet.  *if you were not here Friday – complete two ray diagrams then complete the first three problems on your Intro to Mirrors Worksheet

Classwork: