SP212‐Spring‐2016 CH‐34‐B Assignment First do the following Wiley‐Plus assignment: Assignment #34b After completing the Wiley‐Plus, in your homework notebook, complete the following problems: CH34 Questions # 9. CH34 Problems # None additional To check your work, the answers to the odd problems are in the back of the book. The answers to the even problems are: None additional assigned this assignment. Homework Then complete the attached worksheets: (Note: the above problems were designed to ensure you have the skills to solve the worksheet problems. It is imperative to your learning of the problem solving technique to do the above problems BEFORE attempting the worksheet problems. You are graded on both! Homework notebooks are graded.) CH‐34‐B‐1: For each of the equations below, 1) State what each term is in your own words … 2) What the units of each term are… 3) What is the general use of that equation in your own words? 1  1  1  (n 1)( 1  1 ) r1 r2
p i f
A.
h
B. m   i , m  image p
hobject
n1 n2 n2  n1
, be very specific on this equation’s use  
p i
r
C.
CH‐34‐B‐2: The following two parts are concerned with the thin, plano‐convex lens shown in the diagram. (The front surface is curved and the back surface is flat.) The lens has a focal length of +20 cm and is made using a material with a refractive index of 1.5. a.
What is the radius of curvature of the front side of the lens? Show all work b.
If a real object is 60 cm to the left of the lens, fully describe the image (upright or inverted, real or virtual, location relative to the lens, bigger or smaller? Show all work CH‐34‐B‐3: The subject of the next two parts of this problem is the experimental setup shown in the diagram. A converging, double convex lens (The shape of the lens is as shown.) has a focal length of 20.0cm. The magnitude (absolute value) of the radius of curvature of each face is 28.0 cm. An object is at the origin of a coordinate system (x = 0) and the lens is 40 cm away (x = 40.0 cm). a. The refractive index of the material from which the lens is made is closest to A. 1.50.
B. 1.55.
C. 1.60.
D. 1.65.
E. 1.70.
Show all work b. The following statement best describes the result of an attempt to locate a clear (in focus) image on the screen. A. An upright image is formed when the screen is at x = 160 cm. B. An inverted image is formed when the screen is at x = 160 cm. C. An upright image is formed when the screen is at x = 80 cm. D. An inverted image is formed when the screen is at x = 80 cm. E. An image cannot be formed on the screen because the image is virtual. Show all work\Explain: CH‐34‐B‐4: Two converging lenses are placed 60 cm apart. The focal length of the first lens is 30 cm and the focal length of the second lens is 10 cm. An object is placed 80 cm to the left of the first lens as shown. The final image: a. Upright or inverted? b. Larger or Smaller? (Including the magnification calculation to prove it) c. Real or Virtual? d. Located where in relationship to the center of Lens 2? e. By what factor would your I2 distance change from your answer in part (d), if the initial object was placed at 50cm instead? Lens 1
F1
F1
Drawing is not to scale!
Show all work (Show ray traces too): Lens 2
F2
F2