Focal Length of Lenses

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Znywhn

Science

Description

Please answer all post-lab questions 1 to 5, and

make sure to complete calculation tables, and

create a one page summary on the experiment.


Questions and Data tables are attached below as well as some additional notes.


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41 lo LABORATORY 41 Focal Length of Lenses LABORATORY REPORT Data Table 1 Lens Focal Length (cm) Image Distance (cm) 19.5 А fA= 19.5 B fo lo Data Table 2 Calculations Table 2 p (cm) 9 (cm) fs (cm) % Diff Q; (cm) fs (cm) 10.ol Pienlacem ) ) 19 21.2 ts te 636-6 h 13 56.8 14 10.12 W % 10.57 (2 78 为 10.4 Data and Calculations Table 3 (Lenses A & B) q (p=0) P 4 fAB P=00 fAB P &q Ae theo % Diff FAB 6.15 6.1 6.1 6.2 42.7 7.3 Data and Calculations Table 4 (Lenses B & C) P 9. fac p & 9 fo COPYRIGHT © 2008 Thomson Brooks/Cole 9 (p=00) 12 fac p=0 12 IBC 12.11b 12.32 22- 28 419 420 Physics Laboratory Mamal Loyd SAMPLE CALCULATIONS pg 1. f = P + 2. TAB = (ABl + fasa)/2 = 3. (AB)theo = (A) (B)/(a+) = 4. fc =(fb)(fa)/(f8-foc) = QUESTIONS 1. Why is it not possible to form a real image with lens C alone? 2. Take lens C between your thumb and index finger. Is it thinner or thicker at the center of the lens than at the edge? Take lens B between your thumb and index finger. Is it thinner or thicker at the center of the lens than at the edge? From this information alone, what can you conclude about lenses C and B? 3. Consider the percentage difference between the two measurements of the focal length of lens B. Express or as a percentage of f. Is the percentage difference between the two measurements less than the percentage standard error? 4. Compare the agreement between the experimental and theoretical values of fas the focal length of lenses A and B combined. Do these data suggest that Equation 4 is a valid model for the equivalent focal length of two lenses in contact? 5. If lens A and lens C were used in contact, could they produce a real image? State clearly the basis for your answer. You will need to do a calculation. Additional note(s) on completing this lab (Focal Length of Lenses): 1. 2. Please show at least one sample calculation for each unique calculation. For # Q2, you can go online and research using your fingers to test for converging and diverging lenses. Lens C is the diverging lens. For Q5, use the value that you got for Lens A at the beginning, and that for Lens C that you got at the end. Most of the questions given can be answered by knowing the theory. 3. 4.
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Running Head: FOCAL LENGTH OF LENSES

Focal Length of Lenses
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1

FOCAL LENGTH OF LENSES

2

Introduction
Images formed by lenses are either virtue or real. A converging lens forms a real image
while a diverging lens forms a virtue image. When a beam of light is incident to the converging
lens with ray parallel to the central axis of the lens the rays converges at a point called focal
point (Camacho, 2002). The focal length is the distance between the focal point and the center of
the lens. The focal length is taken as positive for a converging lens and negative for a diverging
lens. When a beam of light is incidence to a diverging lens the rays diverge as they leave the
lens. The outgoing rays behave as if they are emerging from a common source. This point is the
focal point of the diverging lens. The equation 1 shown below is relationship between the radius
of curvature, refraction index and the focal length of a given lens.
1
1
1
= (1 − n) ( − ) … … … … … … … . . equation 1
f
R1 R2
Where:
F = focal length, n = refraction index,

R = radius of curvature

The distance of the object from the lens is denoted as p while that of the image to the lens is
denoted as q. The relationship between the two distances and the focal length is given by
equation 2 below
1...


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