1. WEDNESDAY(01/28): Law of Reflection, Plane and Curved Mirrors.

HW: Read and Study pages 457-467, then solve probs. 53, 54, 55,

and 58 on page 479.

2. THURSDAY(01/29): LAB on Reflection of Light.

HW: Process data and write lab report, Due Wednesday.

3. FRIDAY(01/30): Locating Images in Curved Mirrors,

Mathematically. HW: Read and Study pages 467-477, then solve

probs. 61, 62, 63, 64, 69, and 71 on page 480.

This is Bee Week! Wear the colors.

4. MONDAY(02/02): The Law of Refraction (Snell's Law), Speed of Light in Transparent Media, and Internal Reflection. HW: Read and Study pages 485-492, then solve probs.67, 68, 69, 70, and 71 on pages 509.

5.  ORANGE TUESDAY(02/03): LAB on Refraction of Light.

HW: Process data and write lab report, Due Monday.

6.  BROWN   GOLD WEDNESDAY(02/04): Thin Lens Refraction.

HW: Read and Study pages 493-503, then solve probs. 81, 82, 83,

84, and 85 on page 510.

7.   FLOWER  THURSDAY(02/05): LAB on Convex Lenses.

HW: Process data and write lab report, Due Monday.

8.   BLACK  YELLOW  FRIDAY(02/06): REVIEW  - Light, Reflection,

and Refraction. HW: Complete All Review Handouts.

9. MONDAY(02/09): TEST on Ch. 17 & 18 - Light, Reflection and

Refraction. HW: Go to Website for notes on Ch. 19 - Interference

and Diffraction.

1. Light is electromagnetic radiation that consists of oscillating electric

and magnetic fields with different wavelengths; it is also capable of

stimulating the retina of the eye.

2. Light, moving through a vacuum, a travels in a straight line at a

speed c = 3.0 x 10⁸ m/s, and possesses the properties of both waves

and particles.

3. The Law of Reflection Of Light states that the angle of incidence is

equal to the angle of reflection, θ_i = θ_r. Recall that both are measured

relative to the normal.

4. The flat mirrors form virtual images that are the same distance

behind the mirror as the object is in front. Flat mirror images are also

the same size as the object, but are reversed from left to right.

5. Curved mirrors that we will study are either concave, or convex.

They are both "spherical-parabolic." This means that they have some

properties of both a sphere and a parabola.

6. In particular, these mirrors have a radius of curvature, r, and a focal

point, f. The focal length is half the radius of curvature, f = ½r.

7. The mirror equation ( 1/d_o+1/d_i = 1/f ) relates object distance d_o,

image distance d_i, and focal length f of a spherical-parabolic mirror.

8. The magnification equation ( M = h_i/h_o = -d_i/d_o ) relates image height

and distance to object height and distance. All distances measured

behind a mirror are negative. In front, they are positive.

9.The convex mirror has only one case of image formation. For an object

placed at any distance in front of the mirror, the image is virtual (behind

the mirror), smaller, and erect (upright, not inverted).

10. A concave mirror has 6 cases of image formation, all dependent on

where the object is located relative to the front of the mirror.

11. Refraction is the bending of light rays at the boundary between two

media. Refraction occurs only when the incident ray strikes the boundary

at an angle.

12. Snell’s law states that when light goes from a medium with an index

n₁ to another medium with an index n₂, it is bent relative to the normal.

The equation is n₁·sin i = n₂·sin r .

13. Light going from materials with a large n to those with a small n is

bent away from the normal. Some typical indices of refraction are:

vacuum, n = 1.00; air, n = 1.0003; water, n = 1.33. (See page 486.)

14. As a light ray travels from one medium into another medium it

changes speed and the light ray will change its direction unless it

travels along the normal. For the speed change, v = c/n.

15. Total internal reflection can occur if light travels from a medium with

a larger index of refraction, to one with a smaller index of refraction.

If the angle of incidence is greater than the critical angle, the light is

total internally reflected (fiber optics). The equation is sinθ_crit = n₂/n₁.

16. Light waves of different wavelengths have slightly different refractive

indices. Thus they are refracted at different angles. Light falling on a

prism is dispersed into a spectrum of colors.

17. Some materials, calcite for example, exhibit double refraction. This

means that one incident ray of light produces two refracted ones.

18. Mirages and the visibility of the sun after it has physically set are

natural phenomena that can be attributed to refraction of light in Earth’s

atmosphere.

19. A lens is a thin piece of glass that refracts, bends, light. The

different types of lenses are, double concave, double convex, plano-

concave, plano-convex, and convex-o-concave.

20. The location of an image created by a lens can be found using either

a ray diagram or the thin-lens equations, which are the same as the

mirror equations, 1/d_o+1/d_i = 1/f  and  M = h_i/h_o = -d_i/d_{o .}

21. The image produced by a converging lens is real and inverted when

the object is outside the focal point and virtual and upright when the

object is inside the focal point. Diverging lenses always produce upright,

virtual images.

22. We will study double convex (convex), and double concave (concave)

lenses in detail because they have the most applications.

23. For the concave lens, there is only one case of image formation. But

for the convex, we have 6 cases all based on where the object is located.

24. And still, we need these steps to solve any problem in Physics:

(i) read the problem and identify the given variables

(ii) determine what you are asked to solve for

(iii) find the correct motion formula to use

(iv) use algebra to isolate the unknown

(v) substitute-in the given information and simplify.

Answers to Homework:

Page 479: 53. 38^o, 54. 53^o, 106^o, 55. 108^o, 58. (diagram & explain)

Page 480: 61. 20 cm, 62. .50 cm, 63. 1.8 m, 64. real, inverted, larger

               69. 5, 71. -24 cm, 9.0 cm

Page 509: 67. 1.33, water, 68. 20.8^o , 69. 25.4^o , 28.9^o ,

               70. 1.24x10⁸ m/s, 71. 24.4^o

 Page 510: 81. (draw diagram), 34 cm, 82. 39.3 cm, 83. 10.0 cm,

                 84. 14 cm, 85. (draw diagram), -1.8 cm

THE HONORS PHYSICS SEMESTER 1 ARCHIVES Ch.1: Physics Intro. Ch.2&3: Linear Motion. Ch.4&5: Forces. Ch.6: 2-Dim Motion. Ch.7: Gravitation. Ch.8: Rotary Motion. Ch.9: Momentum. Ch.10&11: Work&Energy. Ch.12: Thermal Energy. Ch.13: States of Matter. Semester Review. Ch.14&15: Waves&Sound. Ch.16: Study of Light. Ch.17&18: Mirrors & Lenses. Ch.19: Light Interference.