1. A) Reflection: qi = qr B) Refraction: n1 sin(q1)= n2 sin(q2)
Flat Mirror: image equidistant behind
Spherical Mirrors: Concave or Convex
B) Refraction: q1 q2 n2 n1
n1 sin(q1)= n2 sin(q2)
Flat Lens: Window
Spherical Lenses: Concave or Convex
C) Absorption:

2. glass
silver
Mirrors are backed by a very thin layer of metal which reflects the light.
paint

3. Mirrors produce an upright, virtual image that is laterally inverted
Lateral Inversion
Virtual
Cannot be projected onto a screen.

4. i = r i = incident angle r = reflected angle Reflection
measured from the normal
r = reflected angle
A line  to the surface at the point of incidence
i = r
Law of reflection

5. Millions of light rays reflect from objects and enter our eyes – that’s how we see them!
When we study the formation of images, we will isolate just a few useful rays: or

7. Ex: glossy vs. flat paint

8. Image in a Plane Mirror
Mirror
Object
Image

9. How tall a mirror do you need to be able to see your entire body?
Does it matter how far away from the mirror you stand?

10. Multiple Reflections ( 2 or more mirrors)
object
image
image
image

11. Joe sees the image of a book as shown from above
Joe sees the image of a book as shown from above. Where does Joe see the image. (Joe would see the object as being at the image point if he didn’t know that the mirror existed.) C A B D
JOE
Book
Mirror A B C D
None of the above

12. Joe sees an image which is on a dotted line through the book and perpendicular to the mirror, as shown. Then, Joe moves sideways as shown by the brown arrow. Compared to its original location, the image that he sees
Physics Book
Mirror A
JOE
moves above
Moves toward mirror
Doesn’t move
Is at the same distance from the mirror but above the dotted line
At the same distance but below the dotted line
On the dotted line but moves toward the mirror
On the dotted line but moves away from the mirror.

13. The mirror in the following figure deflects a horizontal laser beam by 60o. What is the angle Φ?

14. A laser beam is incident on the left mirror in the following figure
A laser beam is incident on the left mirror in the following figure. If I want the reflected beam to be always parallel to the incident beam regardless of the direction of the incident beam, what should the angle θ be? θ
45o
60o
90o
120o

15. Now if θ is 80o, what is the angle Φ of the reflected laser beam?

16. Pool
Table
Problem
Bank the ball off
the top rail into
pocket A A

17. Pool
Table
Problem
Bank the ball off
side and top rail
into pocket A A

18. A*
Pool
Table
Problem
mirror A

19. A*** A*
Pool
Table
Problem
mirror
A**
mirror A