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Physics Honors/AP 1 and 2

Chapter 23: 6-10 Assignment

Course Materials are always under revision! Weblecture content may change anytime prior to two weeks before scheduled chat session for content.

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Homework

Physcis 23: 6-10 Refraction and Lenses

Homework

Reading Preparation

Text Reading: Giancoli, Physics - Principles with Applications, Chapter 23: Sections 6 to 10

Study Points

Key Equations

RelationshipFormulaVariables
Critical angle for Total Reflection   sin   θ c   = n 2 n 1   θc = angle at which light from the source is reflected parallel to the interface.
n1 = refraction index of first medium.
n2 = refraction index of medium beyond interface
Lens Power in diopters P   =   1 f f = focal length of lens
Thin lens equation (converging) 1 d 0   +   1 d i    =    1 f   do = distance between object and lens
di = distance between lens and image
f = focal length of lens
Thin lens equation (diverging) 1 d 0     1 d i    =     1 f   do = distance between object and lens
di = distance between lens and image
f = focal length of lens
Magnification m   =   h i h o   =     d i d o ho = height of object
hi = height of image
do = distance to object (positive if object and source are on same side of lens)
di = distance to image (positive if image on opposite side of lens from source; positive for real image and negative for virtual image)
Lensmaker's Equation 1 f   =   ( n   1 )   ( 1 R 1   +   1 R 2   ) f = focal length
n = index of refraction
R1 = radius of curvature of far side
R2 = radius of curvature of near side

Web Lecture

Read the following weblecture before chat: Lenses

Study Activity

Use the simulator Ray Optics Site to play with concepts of refractrion.

  • From the tools, select Glasses > Ideal Lens and draw vertical straight line thin lens in the middle of the screen.
  • Select a point source and place it to the left of the mirror.
  • What happens to beams that intersect with the mirror as you move the point source towards and away from the mirror?
  • What happens to beams that miss the mirror or are directed away from the mirror?
  • Select Extended Rays, which creates the path of the bent rays. Where is the focal point?
  • Use reset to clear the screen and start a new experiment.
  • Continue experimenting with mirrors of different shapes. What happens to the rays reflected from a circular curve if the source is above the axis of curvature? Closer to the mirror than the radius of curvature? Further than the focal point?

Chat Preparation Activities

Chapter Quiz

Lab Work

If you want lab credit for this course, you must complete at least 12 labs (honors course) or 18 labs (AP students). One or more lab exercises are posted for each chapter as part of the homework assignment. We will be reviewing lab work at regular intervals, so do not get behind!